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Are you looking for a list of nouns that start with O? Actually, there are many words that start with O in the English language. Don’t fret, though. We don’t expect you to merely take these words for it. Instead, stick around and read on to the next section. It is a list containing various nouns starting with the letter O.
Nouns That Start with O
What Are Nouns That Start With O?
O isn’t necessarily a letter that people think about words starting with. In fact, you might believe there aren’t many nouns, verbs, or adjectives that begin with the fifteenth letter of the alphabet. However, there are many nouns that start with O, some common examples include ocean, octopus, onion, opera, office, oven, orchid, orb, oyster, and observatory.
Common Nouns That Start with O
| Nouns | Examples |
|---|---|
| Oak | The oak tree was more than 300 years old. |
| Oar | He used an oar to paddle the boat. |
| Oasis | The oasis provided a much-needed respite from the desert heat. |
| Oat | The farmer planted oats in the field to feed his livestock. |
| Oath | He took an oath to tell the truth in court. |
| Obelisk | The obelisk stood tall in the city square. |
| Object | She picked up the object and examined it closely. |
| Obligation | It’s my obligation to take care of my elderly parents. |
| Observation | Through careful observation, she was able to identify the bird species. |
| Observatory | The observatory was equipped with state-of-the-art telescopes. |
| Obstacle | The fallen tree was an obstacle in our path. |
| Occasion | We dressed up for the special occasion. |
| Occupation | His occupation was a firefighter. |
| Ocean | The ocean stretched out before them, vast and blue. |
| Octave | The song was written in a high octave. |
| Octopus | The octopus changed colors to blend in with its surroundings. |
| Odor | The odor coming from the trash can was unbearable. |
| Offense | The team’s offense was too strong for the opposing team to handle. |
| Office | She worked in a busy office downtown. |
| Officer | The police officer pulled over the speeding car. |
| Official | The official announcement was made at a press conference. |
| Oil | The car needed an oil change. |
| Okra | She fried the okra until it was crispy and golden brown. |
| Olive | The salad was garnished with slices of ripe green olives. |
| Omen | The black cat crossing their path was seen as an omen of bad luck. |
| Onset | The onset of winter brought cold temperatures and snow. |
| Opera | The opera was a grand production with elaborate costumes and sets. |
| Operation | The surgical operation was a success. |
| Operator | The phone operator connected the call to the correct department. |
| Opinion | Everyone is entitled to their own opinion. |
| Opportunity | She saw the job opening as an opportunity to advance her career. |
| Opposition | The opposition party had different ideas on how to run the country. |
| Option | The menu had a vegetarian option. |
| Orange | The orange was juicy and sweet. |
| Orbit | The satellite was in a stable orbit around the earth. |
| Orchestra | The orchestra played a beautiful symphony. |
| Order | She placed an order for a pizza with extra cheese. |
| Ordinary | The day was just an ordinary day, nothing special happened. |
| Organ | The organ was the largest instrument in the church. |
| Organization | The organization was dedicated to helping those in need. |
| Origin | The origin of the custom is shrouded in mystery. |
| Ornament | The tree was decorated with colorful ornaments for the holidays. |
| Orphan | The orphan was taken in by a kind-hearted family. |
| Ostrich | The ostrich is the largest bird in the world. |
| Other | The others in the group were all doctors, but he was a lawyer. |
| Otter | The playful otter swam in the pond. |
| Outcome | The outcome of the election was surprising to many people. |
| Outlet | She plugged the lamp into the electrical outlet. |
| Oval | The track for the race is an oval that measures 400 meters in length. |
| Oven | She baked a batch of cookies in the oven. |
| Owl | The owl hooted softly in the night. |
| Owner | The owner of the store greeted customers with a smile. |
| Ox | The oxen pulled the heavy cart up the hill. |
| Oxygen | The doctor gave her a dose of oxygen to help her breathe. |
Abstract Nouns That Start with O
| Nouns | Examples |
|---|---|
| Objectivity | The news should be reported with objectivity and impartiality. |
| Oblivion | The famous singer fell into oblivion after his scandalous behavior. |
| Obscurity | The author’s work remained in obscurity until it was discovered years later. |
| Observation | The scientist made a careful observation of the behavior of the monkeys. |
| Occasion | The wedding was a joyous occasion for the whole family. |
| Odyssey | The book tells the story of an epic odyssey across the ocean. |
| Offense | The athlete apologized for his unintentional offense against the other team. |
| Offering | The churchgoers brought offerings to the altar during the service. |
| Offspring | The proud parents watched as their offspring graduated from college. |
| Oneness | The spiritual leader spoke about the importance of achieving a sense of oneness with the universe. |
| Openness | The manager encouraged an atmosphere of openness and honesty in the workplace. |
| Opportunity | The scholarship provided an opportunity for the student to attend college. |
| Opposition | The two political parties are in opposition on many issues. |
| Optimism | Despite the setbacks, the team maintained an optimistic outlook for the future. |
| Option | The menu offered a vegetarian option for those who did not eat meat. |
| Order | The waiter took our order and brought us our food promptly. |
| Organization | The nonprofit organization worked to provide aid to those in need. |
| Orientation | The new employees received an orientation to the company’s policies and procedures. |
| Originality | The artist’s work was praised for its originality and creativity. |
| Outcome | The outcome of the experiment was unexpected and surprising. |
| Outrage | The community expressed outrage at the injustice committed against the victim. |
| Outset | The project faced challenges from the outset but was ultimately successful. |
| Ownership | The company claimed ownership of the intellectual property rights to the software. |
Related: Abstract Nouns
Positive Nouns That Start with O
| Noun | Examples |
|---|---|
| Oasis | The oasis provided a much-needed refuge from the desert heat. |
| Oblivion | He drank to oblivion and forgot all his problems. |
| Obsession | His obsession with fitness led him to become a personal trainer. |
| Occasion | The wedding was a joyous occasion for all who attended. |
| Ocean | The ocean was calm and peaceful, with the sun setting over it. |
| Odyssey | The epic Odyssey took the hero through many trials and tribulations. |
| Offering | The church collected offerings to support the local community. |
| Offspring | The proud parents showed off their offspring to all their friends. |
| Omega | The omega represents the end of something and the beginning of something else. |
| Oneness | The philosophy of yoga emphasizes the oneness of body and mind. |
| Opal | She wore a beautiful opal necklace that sparkled in the light. |
| Openness | The company’s culture encouraged openness and honesty among its employees. |
| Opulence | The hotel was known for its opulence and luxury amenities. |
| Oracle | The oracle predicted that the king would be victorious in battle. |
| Orbit | The satellite was placed in a geostationary orbit around the earth. |
| Order | The judge issued an order for the defendant to pay restitution to the victim. |
| Orgasm | The couple experienced intense pleasure during their simultaneous orgasm. |
| Origin | The origin of the universe is a subject of great scientific debate. |
| Ornament | The Christmas tree was adorned with beautiful ornaments and lights. |
| Ovation | The audience gave the performer a standing ovation for his outstanding performance. |
| Overcomer | The cancer patient was an overcomer who refused to let the disease beat her. |
| Overflow | The river experienced an overflow during the heavy rain, causing flooding in the nearby areas. |
| Overjoyment | The young child was filled with overjoyment on Christmas morning. |
| Ownership | The ownership of the company changed hands after a hostile takeover. |
| Oxymoron | “Jumbo shrimp” is an example of an oxymoron, where two opposite words are used together. |
Proper Nouns That Start with O
- Obama
- Ohio
- Oklahoma
- Olympus
- Oman
- Oprah
- Orange County
- Oregon
- Orlando
- Osaka
- Oslo
- Oxford
- Oxfam
- Oreo
- Oakley
- Oakland
- Occidental College
- Ocean City
- Ocean Spray
- Oceania
- Odyssey
- Othello
- Ozark
- Ozaukee County
- Ozzy Osbourne
List of Nouns that Start with O
- Oak
- Oasis
- Oath
- Oathe
- Oatmeal
- Obedience
- Obelisk
- Obesity
- Object
- Objectification
- Objection
- Objective
- Objectivity
- Objector
- Obligation
- Oblige
- Obliteration
- Oblivion
- Oboist
- Obscenity
- Obscurity
- Observance
- Observation
- Observer
- Obsession
- Obsidian
- Obstacle
- Obstructionist
- Obverse
- Ocarina
- Occasion
- Occlusion
- Occupancy
- Occupant
- Occupation
- Occurrence
- Ocean
- Oceanography
- Ocelot
- Ocher
- Ochre
- Octahedron
- Octoroon
- Odor
- Odyssey
- Oep
- Offal
- Offender
- Offense
- Offer
- Offering
- Offersey
- Office
- Officer
- Official
- Officialdom
- Offing
- Offspring
- Ohio
- Oil
- Oilcloth
- Oilheating
- Oilseed
- Ointment
- Oiticica
- Okra
- Oleomargarine olive
- Ome
- Omelet
- Omen
- Omission
- Ommission
- Omnipotence
- Oneupmanship
- Onion
- Onlooker
- Onrush
- Onset
- Onslaught
- Ooh
- Ooze
- Open
- Opener
- Opening
- Opera
- Operand
- Operation
- Operator
- Operetta
- Opinion
- Opium
- Opponent
- Opportunism
- Opportunity
- Opposite
- Opposition
- Oppression
- Opprobrium
- Optimality
- Optimism
- Optimization
- Optimum
- Option
- Oracle
- Oration
- Orator
- Oratorio
- Oratory
- Orb
- Orbit
- Orchard
- Orchestra
- Orchestration
- Ordeal
- Order
- Ordering
- Orderly
- Ordinance
- Ordinary
- Ordnance
- Organ
- Organdy
- Organification
- Organism
- Organist
- Organization
- Orgasm
- Orgone
- Orgy
- Orientation
- Origin
- Original
- Originality
- Origination
- Ornament
- Ornamentation
- Orphan
- Orphanage
- Orthicon
- Orthodontist
- Orthography
- Orthophosphate
- Oscillation
- Oscillator
- Osmium
- Ossification
- Ostracism
- Otter
- Ounce
- Ouster
- Outback
- Outbreak
- Outburst
- Outcast
- Outcome
- Outcry
- Outfield
- Outfielder
- Outfit
- Outflow
- Outgrowth
- Outhouse
- Outing
- Outlaw
- Outlawry
- Outlay
- Outlet
- Outline
- Outlook
- Outpatient
- Outpost
- Outpouring
- Output
- Outrage
- Outreach
- Outset
- Outside
- Outsider
- Oval
- Ovation
- Oven
- Overall
- Overcast
- Overcoat
- Overcrowding
- Overestimation
- Overexploitation
- Overflow
- Overhang
- Overhaul
- Overhauling
- Overhead
- Overheating
- Overlay
- Overload
- Overnight
- Overpayment
- Overpopulation
- Overpressure
- Overprotection
- Overriding
- Overrun
- Overseer
- Oversight
- Oversimplification
- Overthrow
- Overtime
- Overture
- Overweight
- Owl
- Owner
- Ownership
- Owning
- Oxalate
- Oxcart
- Oxen
- Oxidation
- Oxide
- Oxygen
- Oxytetracycline
- Oyster
- Ozone
Nouns that Start with O with Meanings
Oak
Obviously, nouns that start with O come in many different shapes and sizes. Oak is a short three-letter word and is the name of a tree. Not only that but the noun can be used to describe the wood from an oak tree as well.
Oasis
Music buffs, we are not talking about the band Oasis, although, that is a noun too. The oasis that’s being referred to here is a fertile area in a dry region. Those who find such places often never want to leave because they’re beautiful, calming, and relaxing.
Ohio
Ohio is only one of fifty states in the United States. It isn’t a small spot, either, so you’ve likely heard the name before. Research reveals that Ohio features an area of 44,825 square miles. It was home to a population of 11.80 million in 2020. However, that number very well could have increased by now, and why wouldn’t it have? People flock to this location for reasons like the weather, the Pro Football Hall of Fame, and the Rock and Roll Hall of Fame.
Office
Next up on this list of nouns that start with O is the word office. An office is a place where people go to perform work duties. This is usually at a location other than their houses, but those who have remote jobs sometimes have home offices as well.
Okra
The okra plant creates long edible beaked pods. This type of food can be eaten alone, as some people enjoy it fried. Meanwhile, others add okra to dishes such as gumbo or vegetable stew.
Some Last Thoughts
So, as you can see, there are plenty of nouns that start with O. The ones listed here barely even begin to scratch the surface. If you want to learn about others, type in a few keywords and perform a Google search. Or are you not about technology? That’s fine. Head to the library or get out that dusty dictionary on the bookshelf and see what you can find.
Resources Related to O Nouns
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