Pack most common English words that start with O in your mind

English words that start with O

Word class

Pronunciation

Meaning

Oak

Noun

/əʊk/

The old oak tree provided shade on hot summer days.  

Odd

Adjective

/ɑːd/

It's odd that he hasn't replied to my message yet.

Ode

Noun

/əʊd/

The poet recited an ode to the beauty of the sunset.

Oke

Adjective

/əʊk/

The furniture in the living room looked oke, but it was a bit outdated.

Opt

Verb

/ɑːpt/

I would opt for the vegetarian option if I were you.

Orb

Noun

/ɔːrb/

The orb in the king's hand glowed brightly and radiated power.

Ore

Noun

/ɔːr/

The miners worked hard to extract the valuable ore from the earth.

Owe

Verb

/əʊ/

I owe my success to the support and encouragement of my family.

Owl

Noun

/aʊl/

The owl hooted in the night, sending shivers down my spine.

Own

Adjective

/əʊn/

I'd like to have my very own apartment.

English words that start with O

Word class

Pronunciation

Example

Once

Adverb

/wʌns/

Once you learn how to ride a bike, you never forget.

Oath

Verb

/əʊθ/

The new president took an oath to uphold the Constitution.

Open

Verb

/ˈəʊpən/

The window was open, letting in a cool breeze.

Oven

Noun

/ˈʌvn/

The bread is baking in the oven and smells delicious.

Oval

Adjective

/ˈəʊvl/

The track was oval-shaped and perfect for running.

Ooze

Verb

/uːz/

The mud oozed between my toes as I walked through the swamp.

Omit

Verb

/əˈmɪt/

Don't omit any details from your report, no matter how small they may seem.

Oily

Adjective

/ˈɔɪli/

The surface of the water was oily and slick, making it difficult to swim.

Opus

Noun

/ˈəʊpəs/

Beethoven's ninth symphony is considered his greatest opus.

Omen

Noun

/ˈəʊmən/

Seeing a black cat crossing your path is often considered an omen of bad luck.

Only

Adjective

/ˈəʊnli/

He was the only person in the room who knew the answer.

Orca

Noun

/ˈɔːrkə/

We were lucky enough to witness a pod of orcas hunting for their dinner in the wild.

English words that start with O

Word class

Pronunciation

Example

Oasis

Noun

/əʊˈeɪsɪs/

The oasis provided a welcome break from the hot desert. 

Obese

Adjective

/əʊˈbiːs/

Due to his unhealthy eating habits, John has become obese and is at risk for developing diabetes.

Ochre

Noun

/ˈəʊkər/

The cave paintings were created using ochre and charcoal.

Offal

Noun

/ˈɔːfl/

The restaurant uses every part of the animal, including the offal, in their dishes.

Onset

Noun

/ˈɑːnset/

The onset of winter brought snow and cold temperatures

Oomph

Noun

/ʊmf/

She had the oomph to complete the marathon.

Opium

Noun

ˈəʊpiəm/

Opium is a highly addictive drug that can cause serious health problems.

Optic

Noun

/ˈɑːptɪk/

The optic nerve connects the eye to the brain.

Otter

Noun

/ˈɑːtər/

The playful otters were swimming and diving in the river. 

Overt

Noun

/əʊˈvɜːrt/

The company's overt goal is to reduce carbon emissions and promote sustainability.

Ozone

Noun

/ˈəʊzəʊn/

The ozone layer protects us from the harmful effects of the sun's rays.

English words that start with O

Word class

Pronunciation

Example

Object

Noun

/ˈɑːbdʒɪkt/

The main object of the project was to increase sales.

Obtain

Verb

/əbˈteɪn/

He was finally able to obtain the necessary permits.

Ocean 

Noun

/ˈəʊʃn/

The ocean covers over 70% of the Earth's surface.

Occult

Adjective

/əˈkʌlt/

The occult practices of the group were shrouded in secrecy.

Octave

Noun

/ˈɑːktɪv/

She sang a perfect octave higher than the melody.

Offend

Verb

/əˈfend/

She didn't mean to offend him with her comment.

Onyxes

Noun

/ˈɑːnɪks/

The earrings were made of black onyxes and diamonds.

Opaque

Adjective

/əʊˈpeɪk/

The windows were covered in an opaque film for privacy.

Oppose

Verb

/əˈpəʊz/

I strongly oppose the proposed changes.

Option

Noun

/ˈɑːpʃn/

She had the option to take the train or the bus.

Orange

Noun

/ˈɔːrɪndʒ/

He peeled an orange and ate the juicy segments.

Orient

Verb

/ˈɔːrient/

The map was oriented to the north.

Origin

Noun

/ˈɔːrɪdʒɪn/

The origin of the universe is still a mystery.

Ornery

Adjective

/ˈɔːrnəri/

The ornery old man refused to help anyone. 

Ossify

Verb

/ˈɑːsɪfaɪ/

The cartilage in his knee had started to ossify.

Outfit

Noun

/ˈaʊtfɪt/

He wore a stylish outfit to the party.

Outlet

Noun

/ˈaʊtlet/

The shopping mall has several outlet stores for discounted merchandise.

Output

Noun

/ˈaʊtpʊt/

The printer's output was of high quality.

English words that start with O

Word class

Pronunciation

Example

Oversee

Verb

/ˌəʊvərˈsiː/

A team of experts is responsible for overseeing the project.

Overrun

Verb

/ˈəʊvərʌn/

The city was overrun by tourists during the summer.

Overlap

Verb

/ˌəʊvərˈlæp/

The two circles overlap in the middle.

Outpost

Noun

/ˈaʊtpəʊst/

The army set up an outpost in the mountains.

Outpace

Verb

/ˌaʊtˈpeɪs/

The athlete was able to outpace his competitors and win the race.

Organic

Adjective

/ɔːrˈɡænɪk/

The vegetables were grown using only organic methods.

Outcome

Noun

/ˈaʊtkʌm/

The outcome of the experiment was unexpected.

Operose

Adjective

/ˈɒpəˌrəʊs/

The project was more operose than they had anticipated.

Operate

Verb

/ˈɑːpəreɪt/

The surgeon will operate on his knee tomorrow.

Ominous

Noun

/ˈɑːmɪnəs/

The dark clouds on the horizon were ominous.

Offense

Noun

/əˈfens/

His rude comments were taken as a personal offense.

Obscure

Adjective

/əbˈskjʊr/

The meaning of the ancient text was obscure.

Obesity

Adjective

Obesity is a major health concern in many countries.

English words that start with O

Word class

Pronunciation

Example

Overseas

Noun

/ˌəʊvərˈsiːz/

He travels overseas for work.

Overlook

Verb

/ˌəʊvərˈlʊk/

Our hotel room overlooked the harbor.

Overture

Noun

/ˈəʊvərtʃər/

The orchestra played the overture before the start of the play.

Outdated

Adjective

/ˌaʊtˈdeɪtɪd/

His computer was outdated and slow.

Outbreak

Noun

/ˈaʊtbreɪk/

There was an outbreak of the flu in the school.

Ornament

Noun

/ˈɔːrnəmənt/

The Christmas tree was decorated with beautiful ornaments.

Optimism

Noun

/ˈɑːptɪmɪzəm/

Her optimism helped her get through difficult times.

Optician

Noun

/ɑːpˈtɪʃn/

I need to see an optician for a new pair of glasses.

Operatic

Adjective

/ˌɑːpəˈrætɪk/

The grand opera was a beautiful operatic performance.

Omission

Noun

/əˈmɪʃn/

The omission of his name from the list was a mistake.

Occasion

Noun

/əˈkeɪʒn/

We dressed up for the special occasion.

Obstacle

Noun

/ˈɑːbstəkl/

The fallen tree was an obstacle on the hiking trail.

Obsessed

Adjective

/əbˈses/

He was obsessed with finding a cure for the disease. 

Oblivion

Noun

/əˈblɪviən/

The old building fell into oblivion and was eventually demolished.

Odorless

Adjective

/ˈəʊdərləs/

The cleaning solution was odorless and didn't leave a smell behind.

Obsolete

Adjective

/ˌɑːbsəˈliːt/

The technology used in this device is now obsolete.

English words that start with O

Word class

Pronunciation

Example

Overpower

Verb

/ˌəʊvərˈpaʊər/

The strong wind was able to overpower the small boat.

Outlander

Noun

/ˈaʊtˌlændə/

The outlander felt out of place in the new environment.

Outspoken

Adjective

/aʊtˈspəʊkən/

She is known for being outspoken on political issues.

Offensive

Adjective

/əˈfensɪv/

His comments were very offensive to me.

Oscillate

Verb

/ˈɑːsɪleɪt/

The fan was oscillating back and forth, providing a cool breeze.

Organized

Adjective

/ˈɔːrɡənaɪzd/

She is not a very organized person and she always arrives late at the meetings.

Objective

Noun

/əbˈdʒektɪv/

His main objective this semester is to improve his grades.

Objection

Noun

/əbˈdʒekʃn/

A couple of people raised objections to the proposal.

Operation

Noun

/ˌɑːpəˈreɪʃn/

Less profitable business operations will have difficulty in finding financial support. 

Outsource

Verb

/ˈaʊtsɔːrs/

Some companies outsource to cheaper locations to cut costs.

Officious

Adjective

/əˈfɪʃəs/

The officious neighbor always interferes in our business. 

Obsession

Noun

/əbˈseʃn/

His obsession with fitness has led him to work out for hours every day.

Objectify

Verb

/əbˈdʒektɪfaɪ/

The media often objectifies women, reducing them to objects.

English words that start with O

Word class

Pronunciation

Example

Omnivorous

Adjective

/ɑːmˈnɪvərəs/

Bears are omnivorous, eating both plants and animals.

Occasional

Adjective

/əˈkeɪʒənl/

I enjoy an occasional glass of wine with dinner.

Oleaginous

Adjective

/ˌəʊliˈædʒɪnəs/

The food was dripping with oleaginous sauce.

Obligation

Noun

/ˌɑːblɪˈɡeɪʃn/

As a citizen, it is our obligation to pay taxes and obey the law.

Originally

Adverb

/əˈrɪdʒənəli/

The novel was originally written in French before it was translated into English.

Occurrence

Noun

/əˈkɜːrəns/

The occurrence of earthquakes is common in areas with high tectonic activity.

Occupation

Noun

/ˌɑːkjuˈpeɪʃn/

His occupation as a doctor allows him to help people and make a positive impact in their lives.

Outpatient

Noun

/ˈaʊtpeɪʃnt/

After the surgery, he became an outpatient and visited the hospital for regular check-ups.

Outrageous

Noun

/aʊtˈreɪdʒəs/

The price of the concert tickets was outrageous, and many fans couldn't afford to go.

Outfielder

Noun

/ˈaʊtfiːlder/

The team's outfielder made a spectacular catch to save the game in the final inning.

Oppression

Noun

/əˈpreʃn/

The country was under the oppression of a ruthless dictator for many years.

Ordinarily

Noun

/ˌɔːrdnˈerəli/

Ordinarily, I don't eat breakfast, but today I made an exception.

Oppressive

Noun

/əˈpresɪv/

The oppressive heat made it difficult to enjoy the outdoor activities. 

Ornamental

Noun

/ˌɔːrnəˈmentl/

The garden was filled with ornamental flowers and sculptures.

Observable

Noun

/əbˈzɜːrvəbl/

The scientist made several observable changes to the experiment to get more accurate results.

Obligatory

Adjective

/əˈblɪɡətɔːri/

It is obligatory to wear a seatbelt while driving a car.

English words that start with O

Word class

Pronunciation

Example

Opportunity

Noun

/ˌɑːpərˈtuːnəti/

This job offer is a great opportunity for me to advance my career.

Outstanding

Adjective

/aʊtˈstændɪŋ/

The performance of the team was outstanding, and they were awarded a prize.

Obstruction

Noun

/əbˈstrʌkʃn/

The road was blocked by an obstruction.

Operational

Adjective

/ˌɑːpəˈreɪʃənl/

The new system is now operational and running smoothly.

Objectivity

Noun

/ˌɑːbdʒekˈtɪvəti/

Journalists strive for objectivity when reporting on news stories.

Orientation

Noun

/ˌɔːriənˈteɪʃn/

The orientation program for new employees will be held next week.

Observation

Noun

/ˌɑːbzərˈveɪʃn/

Through careful observation, scientists discovered a new species of insect.

Obstruction

Noun

/əbˈstrʌkʃn/

The construction site has caused an obstruction on the road, causing traffic to be diverted.

Outsourcing

Verb

/ˈaʊtsɔːrsɪŋ/

The company decided to outsource their customer service to a call center in India.

Orthopedics

Noun

/ˌɔːrθəˈpiːdɪks/

The orthopedics department at the hospital specializes in treating musculoskeletal disorders

Observatory

Noun

/əbˈzɜːrvətɔːri/

The observatory is equipped with powerful telescopes for stargazing.

Originality

Noun

/əˌrɪdʒəˈnæləti/

The artist's work is known for its originality and creativity.

Overarching

Adjective

/ˌəʊvərˈɑːrtʃɪŋ/

The overarching goal of the project is to reduce carbon emissions by 50%.

Oscillation

Noun

/ˌɑːsɪˈleɪʃn/

The stock market is known for its frequent oscillations in prices.

Orchestrate

Verb

/ˈɔːrkɪstreɪt/

The project manager will orchestrate the team's efforts to complete the project on time.

Overbearing

Adjective

/ˌəʊvərˈberɪŋ/

The boss's overbearing attitude makes it difficult for employees to work effectively.

English words that start with O

Word class

Pronunciation

Example

Organization

Noun

/ˌɔːrɡənəˈzeɪʃn/

The nonprofit organization is dedicated to helping underprivileged children.

Obliteration

Noun

/əˌblɪtəˈreɪʃn/

The party faces obliteration at the next general election.

Occasionally

Adverb

/əˈkeɪʒnəli/

I only eat meat occasionally, as I mostly follow a vegetarian diet.

Overwhelming

Adjective

/ˌəʊvərˈwelmɪŋ/

The support and encouragement from the community was overwhelming.

Osteoporosis

Noun

/ˌɑːstiəʊpəˈrəʊsɪs/

Osteoporosis is a medical condition that weakens bones and increases the risk of fractures.

Optimization

Noun

/ˌɑːptɪməˈzeɪʃn/

The software company is constantly working on optimization to improve performance.

Occupational

Adjective

/ˌɑːkjuˈpeɪʃənl/

Occupational therapy can help people with disabilities to perform everyday tasks.

Overpowering

Adjective

/ˌəʊvərˈpaʊərɪŋ/

The scent of the flowers was overpowering and filled the entire room.

Overestimate

Verb

/ˌəʊvərˈestɪmeɪt/

He tends to overestimate his own abilities, which can lead to disappointment.

Otherworldly

Adjective

/ˌʌðər ˈwɜːrldli/

The artist's work had an otherworldly quality that was both eerie and captivating.

Ostentatious

Adjective

/ˌɑːstenˈteɪʃəs/

The wealthy woman's house was decorated in an ostentatious style.

Obstetrician

Noun

/ˌɑːbstəˈtrɪʃn/

My obstetrician helped me deliver my baby safely.

Overcapacity

Noun

/ˌəʊvərkəˈpæsəti/

The factory had overcapacity, leading to a backlog of inventory.

Outplacement

Noun

/ˈaʊtpleɪsmənt/

We will assist people who have lost their jobs by providing retraining and outplacement services.

Orthographic

Adjective

/ˌɔːrθəˈɡræfɪk/

Dyslexic children have weak orthographic representation of words.

English words that start with O

Word class

Pronunciation

Example

Opportunistic

Adjective

/ˌɑːpərtuːˈnɪstɪk/

The politician's opportunistic behavior was widely criticized by the public.

Office-holder

Noun

/ˈɑːfɪs həʊldər/

The office-holder was responsible for making important decisions on behalf of the organization.

Observability

Noun

/əbˈzɜːrvəbɪləti/

The observability of the experiment was carefully controlled to ensure accurate results.

Objectionable

Adjective

/əbˈdʒekʃənəbl/

The movie was banned for containing objectionable content.

Ophthalmology

Noun

/ˌɒfθælˈmɒlədʒi/

The patient was referred to an ophthalmologist for their eye condition.

Orchestration

Noun

/ˌɔːrkɪˈstreɪʃn/

The orchestration of the musical score was done by a talented composer.

Obstinateness

Noun

/ˈɒbstɪnətnəs/

Despite repeated warnings, his obstinateness prevented him from changing his mind.

Ornamentation

Noun

/ˌɔːrnəmenˈteɪʃn/

The building's ornamentation included intricate carvings and decorative tiles.

Overemphasize

Verb

/ˌəʊvərˈemfəsaɪz/

The coach warned the team not to overemphasize the importance of winning.

Osteomyelitis

Noun

/ˌɒstɪəʊˌmaɪɪˈlaɪtɪs/

The patient was diagnosed with osteomyelitis, a serious bone infection.

Overabundance

Noun

/ˌəʊvərəˈbʌndəns/

There was an overabundance of food at the party and we couldn't finish it all.

Overqualified

Adjective

/ˌəʊvərˈkwɔːlɪfaɪd/

She applied for the job, but the employer thought she was overqualified for the position.

Oversensitive

Adjective

/ˌəʊvərˈsensɪtɪv/

He's over sensitive and gets upset over small things.

Overconfident

Adjective

/ˌəʊvərˈkɑːnfɪdənt/

The team was overconfident and ended up losing the game. 

Oppositionist

Noun

/ˌɒpəˈzɪʃəˌnɪst/

The oppositionist party is criticizing the government's decision.

Overambitious

Adjective

/ˌəʊvəræmˈbɪʃəs/

She had overambitious goals for her first year of college.

Occidentalize

Verb

/ˌɒksɪˈdɛntəˌlaɪz/

The country has undergone significant changes as it tries to occidentalised its culture. 

Overdominance

Noun

/ˌəʊvəˈdɒmɪnəns/

The overdominance of one species in an ecosystem can have negative impacts on other species.

English words that start with O

Word class

Pronunciation

Example

Otolaryngology

Noun

/ˌəʊtəʊlærɪŋˈɡɑːlədʒi/

My brother has been experiencing ear pain, so he's going to see a specialist in otolaryngology.

Osteoarthritis

Noun

/ˌɑːstiəʊɑːrˈθraɪtɪs/

My grandmother has osteoarthritis in her knees, which makes it difficult for her to walk long distances.

Oversaturation

Noun

/ˌəʊvəˌsætʃəˈreɪʃən/

The market is experiencing oversaturation of the product, which has led to a decrease in demand.

Overpopulation

Noun

/ˌəʊvərˌpɑːpjuˈleɪʃn/

The city's infrastructure is struggling to keep up with the demands of overpopulation.

Organometallic

Adjective

/ɔːˌɡænəʊmɪˈtælɪk/

The chemist is studying the properties of organometallic compounds

Organochlorine

Noun

/ɔːˌɡænəʊˈklɔːriːn/

The use of pesticides containing organochlorine has been banned due to their negative impact on the environment.

Obstructionist

Noun

/əbˈstrʌkʃənɪst/

The opposition party has been accused of being obstructionist and preventing progress in parliament. 

Overcompensate

Verb

/ˌəʊvərˈkɑːmpenseɪt/

After feeling guilty about missing his son's game, the father overcompensated by buying him an expensive gift. 

Overgeneralize

Verb

/ˌəʊvərˈdʒenrəlaɪz/

It's not fair to overgeneralize and say that all politicians are corrupt.

Overoptimistic

Adjective

/ˌəʊvər ˌɑːptɪˈmɪstɪk/

The company was over optimistic about its sales projections and ended up losing money.

Overprivileged

Adjective

/ˌəʊvəˈprɪvəlɪdʒd /

The wealthy heirs were over privileged and had never experienced the hardships of the working class.

Overscrupulous

Adjective

/ˈouvərˈskruːpjələs/

The overscrupulous accountant spent hours double-checking every single number on the report.

Operationalism

Noun

/ˌɒpəˈreɪʃənəˌlɪzəm/

In science, operationalism is the idea that all concepts should be defined in terms of the specific procedures used to measure or manipulate them.

Overspecialize

Verb

/ˌəʊvəˈspɛʃəˌlaɪz/

If you overspecialize in one area, you may miss out on opportunities in other areas."

Overproportion

Noun

/ˌəʊvəprəˈpɔːʃən/

The amount of time and effort they spent on decorating the office was over proportionate to the importance of the task."

Obstructionist

Noun

/əbˈstrʌkʃənɪst/

The opposition party has been accused of being obstructionists and preventing progress in the government's agenda.

English words that start with O

Word class

Pronunciation

Example

Optoelectronics

Noun

/ˌɒptəʊɪlɛkˈtrɒnɪks/

Optoelectronics involves the study and application of electronic devices that emit, detect, and control light.

Omnidirectional

Adjective

/ˌɒmnɪdɪˈrɛkʃənəl/

The new microphone has an omnidirectional pickup pattern, which means it can capture sound from all directions.

Overcapitalized

Adjective

/ˌəʊvəˈkæpɪtəˌlaɪzd/

The company was overcapitalized, and had too much debt and not enough assets to support it. 

Overrepresented

Adjective

/ˌəʊvərɛprɪˈzɛntɪd/

Certain groups are overrepresented in the prison population compared to their representation in the general population.

Ophthalmologist

Noun

/ˌɒfθælˈmɒlədʒɪst/

My eye exam showed that I needed glasses, so I went to see an ophthalmologist for a prescription.

Orthopsychiatry

Noun

/ˌɔːθəʊsaɪˈkaɪətrɪ/

Orthopsychiatry is a branch of psychology that focuses on the prevention and treatment of mental health problems in children and adolescents.

Ontogenetically

Adverb

/ˌɒntəʊdʒəˈnɛtɪkli/

Ontogenetically, humans develop from a single cell to a complex organism over the course of nine months.

Operativenesses

Noun

/ˈɒpərətɪvnəsɪz/

The operativenesses of the new software were tested extensively before it was released to the public.

Observationally

Adverb

/əbˌzɜːvəˈʃənəli/

Observationally, the two species of birds appear to be very similar, but genetically they are quite distinct.

Oceanographical

Adjective

/ˌəʊʃənəˈɡræfɪkəl/

The oceanographical survey revealed a previously unknown underwater mountain range.