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.”
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- Outdated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
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