555+ Extraordinary Words that Start with O in English

Looking for the best articles to read? The following article is the useful list of words that start with O in English. Having a good vocabulary to draw from can help you write more effectively.

Table of Contents

Words That Start with O

Common Words that Start with O

O Words	Example Sentences
Observe	I like to observe the stars at night.
Occur	Accidents can occur at any time.
Offend	I apologize if I offend you with my words.
Offer	The store is offering a discount on all their products.
Often	I often go for a walk in the park.
Old	My grandfather is very old and wise.
On	Please turn on the lights.
Once	I went to Paris once and loved it.
Only	I have only one dollar left in my wallet.
Open	Can you please open the window?
Opinion	Everyone has their own opinion on this matter.
Opportunity	Don’t miss this opportunity to travel abroad.
Opposite	The hotel is located opposite the park.
Option	You have the option to choose between two colors.
Orange	I love eating oranges for breakfast.
Order	I would like to order a pizza for delivery.
Ordinary	This is just an ordinary day for me.
Organize	Let’s organize the books on the shelf.
Original	This painting is an original by Picasso.
Other	I have other plans for this weekend.
Ought	You ought to study harder for your exams.
Out	Please take the trash out.
Outdoor	I love spending time in the outdoor.
Outstanding	Your performance was outstanding.
Over	The game is over, we lost.
Own	I have my own car now.
Owner	The owner of the restaurant is very friendly.
Oxygen	We need oxygen to breathe.
Oyster	I would like to try some fresh oysters.

Things that Start with O

Here are some common things that start with the letter O:

Orange
Octopus
Oven
Oil
Onion
Omelette
Oak
Oar
Office
Opera
Oatmeal
Otter
Owl
Orchid
Ocean
Olive
Oyster
Overcoat
Outlet
Ornament

Adjectives that Start with O

Obese
Obnoxious
Obscene
Obsessive
Obsolete
Obtuse
Occasional
Odd
Odorous
Offbeat
Offensive
Official
Oily
Old-fashioned
Olden
Olive
Olympian
Omnipotent
Omnipresent
Omniscient
Onerous
Only
Open
Opportunistic
Optimistic
Optional
Orange
Orderly
Organic
Ornate

Nouns that Start with O

Oak
Oasis
Oath
Obelisk
Object
Objective
Obligation
Obsession
Obstacle
Occasion
Occupation
Ocean
Octave
Octopus
Odor
Offense
Offering
Office
Officer
Official
Offset
Oil
Ointment
Okay
Olympics
Omega
Omen
Onset
Opera
Opportunity

Verbs that Start with O

Obey
Object
Oblige
Observe
Obtain
Occur
Offend
Offer
Officiate
Ogle
Oil
Omit
Open
Operate
Oppose
Opt
Optimize
Order
Organize
Originate
Ornament
Oscillate
Ostracize
Outdo
Outfit
Outgrow
Outline
Outmaneuver
Outperform
Outshine

Adverbs that Start with O

Obviously
Occasionally
Oftentimes
Often
Once
Onward
Only
Openly
Oppositely
Oppressively
Orderly
Ordinarily
Out
Outdoors
Outlandishly
Outrageously
Outside
Outward
Overboard
Overhead
Overly
Overnight
Overseas
Overwhelmingly
Owlishly

Positive Words That Start With O

Oasis
Objective
Obliging
Observant
Obtainable
Occur
Oceanic
Okay
Olympian
Omnipotent
On
One
Ongoing
Onward
Open
Open-handed
Open-hearted
Open-minded
Opportune
Optimistic
Optimum
Orderly
Organic
Organized
Original
Outstanding
Overcome
Overflowing
Overjoyed
Over-the-moon
Overt
Owning
Ownable
Ozonic

Negative Words that Start with O

Objectionable
Oblivious
Obnoxious
Obscene
Obsessive
Obsolete
Obstructive
Obtuse
Offensive
Officious
Ominous
Opposed
Oppressive
Opprobrious
Opt-out
Outcast
Outdated
Outlawed
Outrageous
Outspoken
Overbearing
Overcast
Overcomplicated
Overcritical
Overcrowded
Overdue
Overly
Overpriced
Oversensitive
Overtaxed

Funny Words that Start with O

Obnoxiously
Octogenarian
Odiferous
Off-kilter
Offbeat
Officious
Okey-doke
Olio
Omg
Omnishambles
Onomatopoeia
Oops
Oopsy-daisy
Opine
Optimist
Orangey
Orangutan
Ouch
Outlandish
Outrageous
Overwhelming
Owlish
Oxymoron
Oyster
Ozone

Full List of Words Starting with O

Oath
Oatmeal
Oats
Obedience
Obliging
Obligingly
Obedient
Obliterate
Obediently
Obese
Object
Objection
Objectionable
Objective
Objectively
Objectivity
Objector
Obligate
Obligated
Obligation
Obligatory
Oblige
Obliged
Obliteration
Oblique
Oblivion
Oblong
Obnoxious
Obnoxiously
Obscure
Obscurity
Observance
Observant
Observation
Oblivious
Observatory
Obesity
Oasis
Oat
Obsessively
Obey
Obituary
Observe
Observer
Obstructive
Obsession
Oaf
Oboe
Obscene
Obscenity
Observable
Oak
Oar
Oceanography
O’clock
Octagon
Oases
Obsolescence
Obsolete
Obstacle
Obstetrician
October
Octopi
Occasional
Obsessive
Occasionally
Octopus
Obstetrics
Obstinacy
Obstinate
Obstinately
Obstruct
Obstruction
Obtrusive
Obtuse
Obviously
Occasion
Obtain
Obtainable
Obsess
Obsessed
Occult
Occupancy
Off
Offbeat
Off-color
Off-white
Often
Odds and Ends
Occupant
Occupation
Occupational
Occupied
Occupy
Obvious
Occur
Od
Odd
Oddity
Odd Jobs
Oddness
Odds
Off-the-record
Off-the-wall
Ode
Odious
Odometer
Odor
Odyssey
Of
Offend
Offense
Offensive
Offender
Oddly
Offer
Occurrence
Ocean
Oceanic
Octagonal
Octave
Offering
Offhand
Oil Well
Oily
Offensively
Officer
Official
Officially
Officiate
Office
Officious
Offing
Off-key
Off-limits
Off-peak
Oils
Offset
Offshoot
Offshore
Oh Well
Off-ramp
Oil
Oiled
Oilfield
Oil Painting
Oil Slick
Oink
Ointment
Old
Olympic Games
Olympics
Old Age
Olden
Old-fashioned
Oldie
Old Testament
Old-timer
One-on-one
Old World
Olive
Olive Oil
Olympic
Ombudsman
Offspring
Offstage
Ok
One-night Stand
Okay
Okra
Ogle
Omen
Oh
Ohm
Ominous
Ominously
Omission
Omniscient
Omit
Ogre
Omnipotence
Omniscience
Omelet
On
Once
Once-over
Oncoming
One
One-sided
Onslaught
Onerous
Onetime
One-to-one
Onion
On-line
Onlooker
Only
Only Child
On-ramp
Onrush
Oneself
Onto
Onus
Onward
Onset
Operationally
Oodles
Operation
One-track Mind
Oops
Ooze
Opal
Opaque
Open
Open-air
Open-ended
Opener
Open House
Opening
Openly
Operational
Open-minded
Openness
Onwards
One-upmanship
One-way
Ongoing
Opera House
Operate
Operatic
Operating System
Operative
Operator
Ophthalmologist
Ophthalmology
Opt
Optometrist
Optometry
Opium
Opossum
Operating Room
Opponent
Opportune
Opportunism
Opportunist
Opportunistic
Open Season
Opera
Opportunity
Opposition
Orchard
Orchestra
Opinion
Oppose
Opposed
Opposite
Oppress
Oppressed
Oppression
Opinionated
Oppressive
Oppressor
Opulence
Optician
Optimism
Operable
Optimist
Optimistic
Optimistically
Optimum
Option
Optic
Opinion Poll
Optical
Optical Illusion
Opulent
Or
Oration
Orator
Oratory
Orbit
Orbital
Orchestral
Orally
Orange
Orangutan
Oral
Orchestrate
Optional
Ordeal
Orchestration
Ordain
Order
Orderly
Ordinal
Ordinance
Original
Ordination
Ore
Organ
Organic
Organically
Orchid
Originality
Organism
Organist
Orgasm
Oriental
Orientation
Oriented
Origin
Ordinarily
Ordinary
Organization
Originally
Originate
Orgy
Orient
Ornament
Ornamental
Ornate
Organizational
Organize
Organized
Ornithologist
Ornithology
Orthopedics
Oscar
Orphan
Organizer
Ornately
Orphanage
Orthodontics
Orthodontist
Ostentatiously
Ostracism
Ostracize
Outer
Oriole
Outermost
Orthodox
Ostentation
Ostentatious
Outer Space
Ostrich
Other
Otherwise
Otter
Ounce
Our
Orthodoxy
Ouster
Out
Outage
Ouch
Ought to
Outback
Outburst
Outcast
Outclass
Outcome
Outcropping
Outgrown
Ovarian
Ovary
Ovation
Outlying
Outmaneuver
Out-of-bounds
Ours
Ourselves
Oust
Outbid
Outboard Motor
Outbreak
Outlook
Outdone
Outdoor
Outfit
Outgoing
Outgrew
Outcry
Outdated
Outdid
Outgrow
Outlaw
Outlay
Outdoors
Outfield
Outfielder
Outlet
Outline
Outdistance
Outdo
Outlive
Out-of-date
Out-of-the-way
Outmoded
Outnumber
Outset
Outshine
Outside of
Outpost
Outpouring
Output
Outrage
Outraged
Outrageous
Out of
Outpatient
Outperform
Outplacement
Outreach
Outrageously
Outran
Outright
Outhouse
Outing
Outlast
Outsider
Outskirts
Outsmart
Outsourcing
Outspoken
Outspokenness
Outstanding
Outrun
Outlandish
Outgrowth
Outstandingly
Outstretched
Outstrip
Outward
Outwardly
Outwards
Outshone
Outside
Overdone
Overdose
Overdraw
Outweigh
Outwit
Oval
Oven
Over
Overboard
Overcame
Overcast
Overcharge
Overcompensation
Overcrowded
Overall
Overalls
Overate
Overbearing
Overdid
Overdo
Overnight
Overpass
Overpopulated
Overdrawn
Overdrew
Overdue
Overeat
Overcoat
Overcome
Overcompensate
Overeaten
Overestimate
Overextend
Overextended
Overhang
Overhaul
Overlap
Overload
Overhead
Overheard
Overjoyed
Overland
Overlook
Overly
Overhead Projector
Overhear
Overflow
Overgrown
Overhand
Overpopulation
Overran
Overtook
Overture
Overturn
Override
Overriding
Overrode
Overrule
Overrun
Oversaw
Overseas
Oversee
Overpower
Overpowering
Overpriced
Overseen
Overseer
Overshadow
Overshoot
Overshot
Oversight
Owe
Owing to
Owl
Oversimplification
Oversimplify
Oversized
Overrate
Overt
Overtake
Overtaken
Oversleep
Overslept
Overthrew
Overrated
Overreact
Overridden
Overstate
Overstep
Over-the-counter
Overtly
Overtone
Overview
Overweight
Overwhelm
Overwhelmed
Overwhelming
Overworked
Overwrought
Ow
Own
Owner
Ownership
Ox
Oxen
Oxide
Oxidize
Overthrow
Overthrown
Overtime
Overwhelmingly
Overwork
Oxygen
Oyster
Ozone
Ozone Layer

Words that Start with O | Infographic

FAQs on Words that Start with O

Q: What is the longest word that starts with O?

A: The longest word that starts with O is “oxyphenbutazone,” which has 14 letters. It is a type of anti-inflammatory medication.

Q: What are some common O words?

A: Some common O words include “ocean,” “orange,” “office,” “operation,” and “opportunity.”

Q: Are there any O words that have a silent letter?

A: Yes, there are several O words that have a silent letter. For example, “often,” “honest,” and “comb” all have a silent “o.”

Q: What are some O words that are difficult to spell?

A: Some O words that are difficult to spell include “onomatopoeia,” “ophthalmologist,” and “orthodontist.” It’s important to practice spelling these words to avoid misspelling them in important documents.

Q: Are there any O words that have multiple meanings?

A: Yes, there are many O words that have multiple meanings. For example, “over” can mean “above,” “finished,” or “too much.” “Order” can mean “a request for something,” “a command,” or “a sequence of things.” It’s important to understand the context in which the word is being used to determine its meaning.

You might also like:

A	B	C
D	E	F
G	H	I
J	K	L
M	N	O
P	Q	R
S	T	U
V	W