800+ Words That Start with O (O Words in English)

A comprehensive list of common words that start with O! In the modern English alphabet, O is the fifteenth letter. In English, O is the fourth most common letter. It originates in Phoenician times, where it meant “eye.” Although most letters have gone through many changes, O has stayed largely the same. O is usually pronounced “oh” or “aw.”

Table of Contents

Words that Start with O

What Are Words that Start with O?

Simple O Words with Examples

Words	Example Sentences
Oak	The old oak tree provided shade on a hot day.
Odd	It’s odd that she didn’t show up to the party.
Off	Turn off the lights before you leave the room.
Oil	The chef drizzled olive oil over the salad.
Okay	“Are you okay?” asked the concerned friend.
Old	My grandfather is quite old, but he’s still active.
One	One of the best books I’ve ever read is “Harry Potter.”
Open	Please open the window to let in some fresh air.
Orange	The orange fruit is rich in vitamin C.
Out	The cat snuck out of the house through the open window.

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Positive Words that Start with O

Oasis
Oath
Obedient
Objective
Oblige
Obliging
Observable
Observant
Obtain
Occasion
Odyssey
Offering
Ok
Olympian
Omnipotent
Omniscient
Ongoing
Onset
Onward
Open
Open-minded
Operable
Opportune
Opportunity
Optimism
Optimum
Option
Opulent
Orchestrate
Ordain
Order
Orderly
Organic
Orgasm
Oriented
Original
Originate
Ornamental
Ornate
Outclass
Outdo
Outperform
Outrank
Outreach
Outshine
Outsmart
Outstanding
Ovation
Overjoyed
Overtake

Explore more: Words that start with O that are positive

Descriptive Words that Start with O

Oafish
Obdurate
Obedient
Obeisant
Obese
Objectionable
Objective
Obligated
Oblong
Obsolete
Obtainable
Obtuse
Obvious
Occasional
Oceanic
Octagonal
Octogenarian
Ocular
Odd
Odious
Offbeat
Offense
Offensive
Official
Oily
Old
Olive
Olympic
One
Only
Opaque
Open
Operatic
Operating
Operative
Opportune
Opposite
Orange
Organic
Ornate
Other
Outbound
Outdated
Outer
Outermost
Outgoing
Outrageous
Outside
Outspoken
Overt

Related: Descriptive Words

Adjectives that Start with O

Oaken
Oaten
Obedient
Obese
Objectionable
Oblate
Obligate
Obligational
Obligatory
Obliging
Oblique
Obliterable
Obliterated
Oblong
Obscene
Obscure
Observable
Observant
Obsolete
Occasional
Occult
Occupied
Oceanic
Ocular
Odd
Oddest
Odorless
Off
Offbeat
Offensive
Offside
Oily
Olden
Olfactory
Olive
Omissive
Omnibus
One
Ongoing
Only
Open
Opened
Operable
Opportune
Opposed
Opposite
Original
Orthodox
Outrageous
Outstanding

Learn more: Adjectives that start with O

Words that Start with O that are Used to Describe Someone

Oafish
Obedient
Objectionable
Obliging
Oblivious
Obnoxious
Obsessive
Obstructive
Occupied
Odd
Odious
Offbeat
Offensive
Old
Older
Oldest
One
One-sided
Open
Opinionated
Oppressive
Optimal
Optimistic
Orderly
Ordinary
Organized
Orphaned
Otherwise
Our
Outgoing
Outlandish
Outmoded
Outraged
Outrageous
Outspoken
Outstanding
Overactive
Overage
Overbearing
Overcautious
Overjoyed
Overrated
Overt
Overweight
Overwhelmed
Overwhelming
Overworked
Overwrought
Overzealous
Own

Discover more: O Words to Describe Someone

Nouns that Start with O

Oaf
Oak
Oar
Oatmeal
Obituary
Object
Objection
Occasion
Occult
Occupation
Ocean
Octopus
Odometer
Odor
Odyssey
Offender
Offer
Office
Officer
Official
Offshoot
Oil
Olive
Omen
One
Onion
Opal
Opening
Opera
Operator
Orb
Orbit
Otter
Outbreak
Outcast
Outcome
Outcry
Outdoors
Outfield
Outhouse
Oval
Ovation
Oven
Over
Overall
Overcoat
Owl
Owner
Ox
Oyster

Learn more: Nouns that start with O

Verbs that start with O

Obey
Object
Obligate
Oblige
Obscure
Observe
Obsess
Obstruct
Obtain
Occlude
Occupy
Occur
Offend
Offer
Officiate
Ogle
Ogle
Omit
Ooze
Open
Operate
Oppose
Oppress
Opt
Optimize
Orbit
Orchestrate
Ordain
Order
Organize
Orientate
Oust
Outgrow
Outlaw
Outline
Outsmart
Outsource
Overburden
Overcome
Overcook
Overdo
Overdraw
Overflow
Overhaul
Overload
Overpower
Oversee
Owe
Own

Find out more: Verbs that start with O

Common Words that Start with O with Examples

Words	Example Sentences
Obedient	The dog was obedient and always followed its owner’s commands.
Obese	The doctor warned the patient that they were at risk for health problems due to being obese.
Objective	The news article was written with an objective point of view, presenting all sides of the story.
Obligation	It is my obligation to attend my sister’s wedding, even though I have a lot of work to do.
Obscure	The meaning of the ancient text was obscure, and scholars struggled to decipher it.
Obsess	My friend is obsessed with collecting antique dolls and has a whole room dedicated to them.
Obsolete	The old computer was obsolete and could no longer run the latest software.
Obstruct	The fallen tree obstructed the road and prevented traffic from passing through.
Obtain	I need to obtain a copy of my birth certificate for my passport application.
Obvious	It was obvious that the politician was lying, as their story kept changing.

Unique Words that Start with O with Meanings

Words	Meanings
Oasis	A fertile spot in a desert, where water is found
Obfuscate	To make something unclear or difficult to understand
Oblivion	The state of being completely forgotten or unknown
Obsequious	Overly eager to please or obey
Odious	Extremely unpleasant or repulsive
Officious	Overly eager in offering unwanted advice or services
Ogle	To stare at someone or something in a lewd or desirous manner
Ominous	Giving the impression that something bad or unpleasant is going to happen
Opaque	Not able to be seen through; not transparent
Opulent	Rich and luxurious
Ornate	Elaborately decorated
Ostentatious	Showy, in an attempt to impress others
Ostracize	To exclude someone from a society or group
Overwrought	In a state of emotional turmoil; excessively nervous or excited

O Words Image

O Words | List of Words that Start with O

Words that Start with Oa

Oafish
Oak
Oaken
Oaks
Oakum
Oar
Oars
Oarsman
Oarsmen
Oases
Oasis
Oat
Oaten
Oath
Oaths
Oatmeal
Oats

Words that Start with Ob

Obduracy
Obdurate
Obedience
Obedient
Obediently
Obeisance
Obeisant
Obelisk
Obelisks
Oberlin
Oberon
Obese
Obesity
Obey
Obeyed
Obeying
Obeys
Obituary
Object
Objected
Objecting
Objection
Objectionable
Objections
Objective
Objectively
Objectives
Objector
Objectors
Objects
Oblate
Oblation
Oblations
Obligate
Obligated
Obligation
Obligational
Obligations
Obligatory
Oblige
Obliged
Obliges
Obliging
Obligingly
Oblique
Obliquely
Obliquity
Obliterable
Obliterate
Obliterated
Obliterating
Obliteration
Oblivion
Oblivious
Oblong
Obloquy
Obnoxious
Obscene
Obscenity
Obscura
Obscure
Obscured
Obscurely
Obscures
Obscuring
Obscurities
Obscurity
Obsequies
Obsequious
Obsequiously
Obsequiousness
Observable
Observance
Observances
Observant
Observation
Observations
Observatories
Observatory
Observe
Observed
Observer
Observers
Observes
Observing
Obsess
Obsessed
Obsession
Obsessive
Obsidian
Obsolete
Obstacle
Obstacles
Obstante
Obstinacy
Obstinate
Obstinately
Obstreperous
Obstruct
Obstructed
Obstructing
Obstruction
Obstructions
Obstructive
Obstructs
Obtain
Obtainable
Obtained
Obtaining
Obtains
Obtrude
Obtruded
Obtruding
Obtrusive
Obtuse
Obtuseness
Obverse
Obviate
Obviated
Obvious
Obviously

Words that Start with Oc

Occasion
Occasional
Occasionally
Occasioned
Occasioning
Occasions
Occlude
Occult
Occupancy
Occupant
Occupants
Occupation
Occupational
Occupations
Occupied
Occupier
Occupiers
Occupies
Occupy
Occupying
Occur
Occurred
Occurrence
Occurrences
Occurring
Occurs
Ocean
Oceanic
Oceans
Ochre
Oct
Octagon
Octagonal
Octavo
October
Octogenarian
Octopus
Ocular
Oculist

Words that Start with Od

Odd
Odder
Oddest
Oddities
Oddity
Oddly
Odds
Odes
Odious
Odium
Odometer
Odor
Odoriferous
Odorless
Odorous
Odors
Odyssey

Words that Start with Oe, Of

Oeuvre
Oeuvres
Of
Off
Offal
Offbeat
Offence
Offences
Offend
Offended
Offender
Offenders
Offending
Offends
Offense
Offenses
Offensive
Offensively
Offer
Offered
Offering
Offerings
Offers
Offhand
Office
Officer
Officered
Officers
Offices
Official
Officially
Officials
Officiate
Officiated
Officiating
Officinalis
Officio
Officious
Officiously
Officiousness
Offing
Offset
Offshoot
Offshoots
Offshore
Offside
Offspring
Often
Oftener
Oftenest
Oftentimes
Ofttimes

Words that Start with Og, Oh, Oi, Ok

Ogden
Ogier
Ogilvie
Ogilvy
Ogle
Oglethorpe
Ogling
Oh
Oil
Oilcloth
Oiled
Oiling
Oils
Oilskin
Oilskins
Oily
Ointment
Ointments
Ok

Words that Start with Ol

Old
Olden
Older
Oldest
Oldfield
Oldham
Oleanders
Olfactory
Olga
Oligarchical
Oligarchy
Oliphant
Olive
Oliver
Olives
Olivet
Olivia
Olivier
Olla
Olly
Olney
Olof
Olsen
Olson
Olympia
Olympian
Olympic
Olympus

Words that Start with Om

Omaha
Ombre
Ombres
Omega
Omelet
Omen
Omens
Omer
Ominous
Ominously
Omission
Omissions
Omissive
Omit
Omits
Omitted
Omitting
Omni
Omnia
Omnibus
Omnibuses
Omnipotence
Omnipotent
Omnipresent
Omniscience
Omniscient
Omnium
Omnivorous

Words that Start with On

On
Once
Oncoming
One
Oneida
Oneness
Onerous
Ones
Oneself
One-sided
Onesimus
Ongoing
Onion
Onions
Online
Onlooker
Onlookers
Only
Onset
Onslaught
Onto
Onward
Onwards
Ooze

Words that Start with Op

Opal
Opalescent
Opals
Opaque
Open
Opened
Opening
Openly
Open-minded
Openness
Opens
Opera
Operable
Operandi
Operas
Operate
Operated
Operates
Operatic
Operating
Operation
Operative
Operatives
Operator
Operators
Opiate
Opiates
Opine
Opined
Opinion
Opinionated
Opinions
Opium
Opossum
Opponent
Opponents
Opportune
Opportunely
Opportunities
Opportunity
Oppose
Opposed
Opposer
Opposers
Opposes
Opposing
Opposite
Opposites
Opposition
Oppositions
Oppress
Oppressed
Oppresses
Oppressing
Oppression
Oppressions
Oppressive
Oppressively
Oppressor
Oppressors
Opprobrious
Opprobrium
Opt
Optic
Optical
Optics
Optimal
Optimism
Optimist
Optimistic
Optimize
Optimum
Option
Optional
Options
Opulence
Opulent

Words that Start with Or

Or
Oracle
Oracles
Oracular
Oral
Orally
Oran
Orange
Oranges
Oration
Orations
Orator
Oratorical
Oratorio
Orators
Oratory
Orb
Orbit
Orbits
Orbs
Orchard
Orchards
Orchestra
Orchestral
Orchestras
Orchestrate
Orchid
Orchids
Ordain
Ordained
Ordaining
Ordains
Ordeal
Ordeals
Order
Ordered
Ordering
Orderlies
Orderliness
Orderly
Orders
Ordinaire
Ordinaires
Ordinance
Ordinances
Ordinarily
Ordinary
Ordination
Ordnance
Ordonnance
Ore
Ores
Organ
Organic
Organism
Organisms
Organist
Organization
Organizations
Organize
Organized
Organizer
Organizers
Organizing
Organs
Organum
Orgasm
Orgies
Orgy
Oriel
Orient
Oriental
Orientalist
Orientals
Orientate
Orientation
Oriented
Orifice
Orifices
Origen
Origin
Original
Originality
Originally
Originals
Originate
Originated
Originates
Originating
Origination
Originator
Originators
Origins
Oriole
Orisons
Ornament
Ornamental
Ornamentation
Ornamenting
Ornaments
Ornate
Ornery
Orphan
Orphaned
Orphans
Orthodox
Orthodoxy
Orthography

Words that Start with Os

Oscar
Oscillating
Oscillation
Oscillations
Osier
Osiers
Osman
Ostensible
Ostensibly
Ostentation
Ostentatious
Ostentatiously
Ostler
Ostracism
Ostrich
Ostriches

Words that Start with Ot, Ou

Other
Otherwise
Otter
Otters
Oud
Ought
Oughtn’t
Ounce
Ounces
Our
Ours
Ourselves
Oursler
Oust
Ousted
Out
Outa
Outbound
Outbreak
Outbreaks
Outbuildings
Outburst
Outbursts
Outcast
Outcasts
Outclass
Outcome
Outcries
Outcry
Outdated
Outdid
Outdo
Outdone
Outdoor
Outdoors
Outer
Outermost
Outfield
Outfit
Outfits
Outflanked
Outflow
Outgoing
Outgrow
Outgrown
Outgrowth
Outhouse
Outhouses
Outing
Outlandish
Outlast
Outlaw
Outlawed
Outlawry
Outlaws
Outlay
Outlet
Outlets
Outline
Outlined
Outlines
Outlining
Outlive
Outlived
Outlook
Outlying
Outmoded
Outnumber
Outnumbered
Outperform
Outpost
Outposts
Outpouring
Outpourings
Output
Outrage
Outraged
Outrageous
Outrageously
Outrages
Outraging
Outram
Outran
Outrank
Outreach
Outriders
Outright
Outro
Outros
Outrun
Outs
Outset
Outshine
Outshone
Outside
Outsider
Outsiders
Outsides
Outskirts
Outsmart
Outsource
Outspoken
Outspread
Outstanding
Outstretched
Outstrip
Outstripped
Outward
Outwardly
Outwards
Outweigh
Outweighed
Outweighs
Outwit
Outwitted
Outwork
Outworks
Outworn
Ouverte

Words that Start with Ov

Ova
Oval
Ovals
Ovaries
Ovary
Ovate
Ovation
Oven
Ovens
Over
Overactive
Overage
Overall
Overalls
Overawe
Overawed
Overbalance
Overbalanced
Overbearing
Overboard
Overborne
Overburden
Overburdened
Overcame
Overcast
Overcautious
Overcharged
Overcoat
Overcoats
Overcome
Overcomes
Overcoming
Overcook
Overcrowded
Overdo
Overdoing
Overdone
Overdraw
Overdrawn
Overdue
Overestimate
Overestimated
Overflow
Overflowed
Overflowing
Overflows
Overgrown
Overhang
Overhanging
Overhangs
Overhaul
Overhauled
Overhauling
Overhead
Overhear
Overheard
Overhearing
Overheated
Overhung
Overjoyed
Overladen
Overlaid
Overland
Overlap
Overlapping
Overlay
Overload
Overloaded
Overlook
Overlooked
Overlooking
Overlooks
Overlord
Overlying
Overmastered
Overmastering
Overmuch
Overnight
Overplus
Overpower
Overpowered
Overpowering
Overpowers
Overran
Overrate
Overrated
Overreach
Overreached
Override
Overrule
Overruled
Overruling
Overrun
Overrunning
Oversea
Overseas
Oversee
Overseer
Overseers
Overset
Overshadow
Overshadowed
Overshadowing
Overshadows
Overshoes
Overshot
Oversight
Overslept
Overspread
Overstep
Overstepped
Overstrained
Overt
Overtake
Overtaken
Overtakes
Overtaking
Overtaxed
Overthrew
Overthrow
Overthrowing
Overthrown
Overthrows
Overtime
Overton
Overtook
Overtop
Overtopped
Overture
Overtures
Overturn
Overturned
Overturning
Overview
Overweening
Overweight
Overwhelm
Overwhelmed
Overwhelming
Overwhelmingly
Overwhelms
Overwork
Overworked
Overwrought
Overzealous
Ovum

Words that Start with Ow, Ox, Oy

Owe
Owed
Owes
Owing
Owl
Owls
Owl’s
Own
Owned
Owner
Owners
Ownership
Owning
Owns
Ox
Oxalic
Oxen
Oxford
Oxidation
Oxide
Oxides
Oxidized
Oxidizing
Oxygen
Oyster
Oysters
Oz
Ozone

Words that Start with O | Images

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Last Updated on April 22, 2023