Words that Start with O | 800+ O Words | Words Starting with O

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. is usually pronounced “oh” or “aw.”

Words that Start with O

Positive Words that Start with O

Below are 50 words that start with O that are considered positive:

  • 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

Descriptive Words that Start with O

Below are 50 words used to describe things that start with O (O words):

  • 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  • Outdated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

Adjectives that Start with O

Adjectives are words that modify nouns and pronouns. They usually are used to provide additional description. Below are 50 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

Words that Start with O that are Used to Describe Someone

Below are 50 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

Nouns that Start with O

A noun is a person, place, thing, or idea. Below are 50 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

Verbs that start with O

A verb is a word that expresses action, state, or the relation between things: Below are 50 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

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Words that Start with O | 1000+ O Words | Words Starting with OPin

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

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