Words that Start With O! In this lesson, you will learn a list of commonly used words starting with O in English with ESL pictures to help you enhance your English vocabulary.
Table of Contents
Words that Start With O
2 Letter Words that Start with O
- Ok
- On
- Or
3 Letter Words that Start with O
- Odd
- Old
- One
4 Letter Words that Start with O
- Oath
- Obey
- Odds
- Odor
- Oily
- Okay
- Omen
- Omit
- Once
- Only
- Onto
- Onus
- Onyx
- Oops
- Ooze
- Open
- Opus
- Oral
- Otto
- Ouch
- Ours
- Oust
- Oval
- Oven
- Over
- Owed
5 Letter Words that Start with O
- Oakum
- Oasis
- Oaten
- Oater
- Obeah
- Obeli
- Obese
- Objet
- Occur
- Ocean
- Ocher
- Ochre
- Ocker
- Ocrea
- Octad
- Octal
- Octet
- Octyl
- Oddly
- Odeon
- Odeum
- Odium
- Odour
- Offal
- Offer
- Often
- Ogham
- Ogive
- Oiled
- Oiler
- Okapi
- Olden
- Older
- Oldie
- Oleic
- Olein
- Oleum
- Olive
- Ology
- Ombre
- Omega
- Oncet
- Onion
- Onlay
- Onset
- Ontic
- Oomph
- Ootid
- Opera
- Opine
- Opium
- Opsin
- Optic
- Orach
- Oracy
- Orang
- Orate
- Orbit
- Order
- Oread
- Organ
- Oribi
- Oriel
- Orlop
- Ormer
- Orris
- Ortho
- Oscar
- Osier
- Osmic
- Ossia
- Ostia
- Other
- Ottar
- Otter
- Ought
- Ounce
- Ousel
- Outdo
- Outer
- Outgo
- Outre
- Ouzel
- Ovary
- Ovate
- Overt
- Ovine
- Ovoid
- Ovolo
- Ovule
- Owing
- Owlet
- Owned
- Owner
- Owsen
- Oxbow
- Oxeye
- Oxide
- Oxids
- Oxime
- Oxims
- Oxlip
- Oxter
- Ozone
6 Letter Words that Start with O
- Oafish
- Object
- Oblast
- Oblate
- Oblige
- Oblong
- Obsess
- Obtain
- Obtuse
- Occult
- Occupy
- Ocelot
- Octane
- Octave
- Octavo
- Octopi
- Ocular
- Oculus
- Oddity
- Odious
- Oedema
- Oeuvre
- Offend
- Office
- Offing
- Offish
- Offset
- Oilman
- Okayed
- Oldest
- Oleate
- Olefin
- Omelet
- Online
- Onrush
- Onside
- Onward
- Oocyst
- Oocyte
- Oodles
- Oolite
- Oolong
- Oompah
- Oozing
- Opaque
- Opener
- Openly
- Operon
- Opiate
- Opioid
- Oppose
- Optics
- Optima
- Option
- Oracle
- Orange
- Orator
- Orchid
- Ordain
- Ordeal
- Ordure
- Orgasm
- Orient
- Origin
- Oriole
- Ormolu
- Ornate
- Ornery
- Orphan
- Orrery
- Osmium
- Osmose
- Osprey
- Ossify
- Ostium
- Ostler
- Ostomy
- Otiose
- Otitis
- Ouster
- Outage
- Outbid
- Outbox
- Outcry
- Outdid
- Outfit
- Outfly
- Outfox
- Outhit
- Outing
- Outlaw
- Outlay
- Outlet
- Output
- Outran
- Outrun
- Outset
- Outwit
- Overdo
- Overly
- Ovonic
- Owlish
- Owning
- Oxford
- Oxtail
- Oxygen
- Oyster
7 Letter Words that Start with O
- Oatmeal
- Obelisk
- Obesity
- Obliged
- Obligor
- Oblique
- Obscene
- Obscure
- Observe
- Obverse
- Obviate
- Obvious
- Oceanic
- Octagon
- October
- Octopus
- Oddball
- Odds-on
- Odorous
- Odyssey
- Oedipal
- Offbeat
- Offence
- Offense
- Offhand
- Officer
- Offline
- Offload
- Offside
- Oilseed
- Olivine
- Olympic
- Omicron
- Ominous
- Omnibus
- Onboard
- Oneness
- Onerous
- Oneself
- Ongoing
- On-hand
- Onshore
- Onstage
- On-time
- Onwards
- Oohlala
- Opacity
- Open up
- Opening
- Operand
- Operant
- Operate
- Opinion
- Oppress
- Optical
- Optimal
- Optimum
- Opulent
- Oration
- Oratory
- Orbital
- Orbiter
- Orchard
- Orderly
- Ordinal
- Oregano
- Organdy
- Organic
- Organon
- Orifice
- Origami
- Orotund
- Oscular
- Osmosis
- Ostrich
- Ottoman
- Outback
- Outcast
- Outcome
- Outcrop
- Outdone
- Outdoor
- Outface
- Outflow
- Outgrew
- Outgrow
- Outlast
- Outlier
- Outline
- Outlive
- Outlook
- Outpace
- Outplay
- Outpost
- Outrace
- Outrage
- Outrank
- Outsail
- Outsell
- Outside
- Outsize
- Outward
- Ovarian
- Ovation
- Overage
- Overall
- Overdue
- Overjoy
- Overlap
- Overlay
- Overpay
- Overran
- Overrun
- Oversaw
- Oversee
- Overuse
- Oxidant
- Oxidase
- Oxidize
8 Letter Words that Start with O
- Obdurate
- Obedient
- Obeisant
- Obituary
- Obligate
- Obliging
- Oblivion
- Observer
- Obsessed
- Obsidian
- Obsolete
- Obstacle
- Obstruct
- Occasion
- Occupant
- Occupied
- Occurred
- Odorless
- Offender
- Offering
- Official
- Offshoot
- Offshore
- Offstage
- Ointment
- Olympiad
- Olympian
- Omission
- On-board
- Oncogene
- Oncology
- Oncoming
- Onlooker
- Onscreen
- Ontology
- Openness
- Operable
- Operatic
- Operator
- Operetta
- Opponent
- Opposite
- Optimism
- Optimist
- Optimize
- Optional
- Opulence
- Ordinary
- Ordinate
- Ordnance
- Organism
- Organist
- Organize
- Orgasmic
- Oriental
- Oriented
- Original
- Ornament
- Orthodox
- Osculate
- Ossified
- Outboard
- Outbound
- Outbrave
- Outbreak
- Outburst
- Outclass
- Outdance
- Outdated
- Outdoors
- Outdrive
- Outfield
- Outgoing
- Outhouse
- Outlying
- Outmoded
- Outpoint
- Outreach
- Outright
- Outscore
- Outshine
- Outshone
- Outsider
- Outsmart
- Outstrip
- Outthink
- Outweigh
- Overbold
- Overcame
- Overcast
- Overcoat
- Overcome
- Overdone
- Overdose
- Overflow
- Overfond
- Overhang
- Overhaul
- Overhead
- Overhear
- Overheat
- Overkill
- Overlaid
- Overland
- Overleaf
- Overload
- Overlook
- Overlord
- Overpass
- Override
- Overrode
- Overrule
- Overseas
- Overseen
- Overseer
- Oversize
- Overtake
- Overtime
- Overtook
- Overture
- Overturn
- Overview
- Overwork
- Oxymoron
9 Letter Words that Start with O
- Obcordate
- Obedience
- Obeisance
- Obfuscate
- Objectify
- Objection
- Objective
- Obligated
- Oblivious
- Obnoxious
- Obscenity
- Obscurity
- Observant
- Obsession
- Obsessive
- Obstetric
- Obstinacy
- Obstinate
- Obtrusive
- Obviously
- Occipital
- Occlusion
- Occlusive
- Occultism
- Occupancy
- Octagonal
- Oddsmaker
- Oestrogen
- Offensive
- Offertory
- Officiate
- Officious
- Offscreen
- Offspring
- Olfaction
- Olfactory
- Oligarchy
- Oligopoly
- Ombudsman
- Oncogenic
- One-liner
- Onslaught
- On-target
- Open-mind
- Operating
- Operation
- Operative
- Ophiolite
- Opportune
- Optometry
- Orangutan
- Orchestra
- Ordinance
- Organized
- Orgiastic
- Orientate
- Originate
- Orphanage
- Orthodoxy
- Orthotics
- Oscillate
- Osteopath
- Ostracism
- Ostracize
- Otherness
- Otherwise
- Ourselves
- Outdoorsy
- Outermost
- Outerwear
- Outfitted
- Outgrowth
- Outlander
- Outnumber
- Outrigger
- Outskirts
- Outsource
- Outspoken
- Outspread
- Outsprint
- Outwardly
- Ovenproof
- Overblown
- Overboard
- Overbuild
- Overdraft
- Overdrive
- Overeager
- Overjoyed
- Overnight
- Overpower
- Overprint
- Overrated
- Overreach
- Overreact
- Oversexed
- Overshoot
- Oversight
- Overspend
- Overspill
- Overstate
- Overstock
- Overtaken
- Overthrow
- Overwhelm
- Overwrite
- Oviparous
- Ownership
- Oxacillin
- Oxidation
- Oxycodone
- Oxygenase
- Oxygenate
10 Letter Words that Start with O
- Obediently
- Obligation
- Obligatory
- Obligingly
- Obliterate
- Obnubilate
- Obsequious
- Observable
- Observance
- Obstetrics
- Obtainable
- Occasional
- Occidental
- Occupation
- Occurrence
- Oceanarium
- Oceanfront
- Oceangoing
- Oceanology
- Ochlocracy
- Octahedral
- Octahedron
- Oculomotor
- Oesophagus
- Officially
- Oftentimes
- Okey-dokey
- Oldfangled
- Oleaginous
- Oligoclase
- Oligopsony
- Olivaceous
- Omnipotent
- Omniscient
- Omnivorous
- Onomastics
- Opalescent
- Open-ended
- Openhanded
- Operculate
- Ophthalmia
- Ophthalmic
- Opposition
- Oppression
- Oppressive
- Opprobrium
- Optimistic
- Orangewood
- Oratorical
- Orchardist
- Ordinarily
- Ordination
- Ordonnance
- Organicism
- Organology
- Originally
- Ornamental
- Ornithopod
- Ornithosis
- Oropharynx
- Orthoclase
- Orthogonal
- Osculation
- Osmolality
- Osmolarity
- Ostensible
- Ostensibly
- Osteoblast
- Osteoclast
- Osteogenic
- Osteopathy
- Otherwhere
- Otherworld
- Outbalance
- Outcompete
- Outfielder
- Outlandish
- Outpatient
- Outperform
- Outpouring
- Outrageous
- Outstation
- Outstretch
- Ovariotomy
- Overactive
- Overbought
- Overburden
- Overcharge
- Overcommit
- Overexpose
- Overextend
- Overflight
- Overgrowth
- Overjoying
- Overmaster
- Overmighty
- Overmodest
- Overpraise
- Overriding
- Overshadow
- Oversimple
- Overspread
- Overstrain
- Overstress
- Overstride
- Oversupply
- Overtaking
- Overweight
- Overwinter
- Ovipositor
11 Letter Words that Start with O
- Objectively
- Objectivism
- Objectivity
- Observation
- Observatory
- Obsolescent
- Obstruction
- Obviousness
- Occultation
- Occupancies
- Octagonally
- Octahedrons
- Octapeptide
- Odontoblast
- Odoriferous
- Odorousness
- Oecumenical
- Offenseless
- Offensively
- Offertories
- Offhandedly
- Officialdom
- Officialese
- Officialism
- Officiaries
- Officiating
- Officiation
- Officiously
- Offprinting
- Offscouring
- Olfactories
- Oligarchies
- Oligochaete
- Oligoclases
- Oligopolies
- Ominousness
- Omnifarious
- Omnipotence
- Omnipotents
- Omnipresent
- Omniscience
- Oncogenesis
- Oneiromancy
- On-the-ball
- On-the-beam
- Ontogenesis
- Ontological
- Open-handed
- Openhearted
- Open-minded
- Operational
- Opinionated
- Opportunist
- Opportunity
- Opprobrious
- Optometrist
- Orchestrate
- Orientalize
- Orientation
- Originality
- Origination
- Originative
- Ornithology
- Ornithopter
- Orthocenter
- Orthodontia
- Orthography
- Orthopedics
- Orthopteran
- Orthoscopic
- Orthostatic
- Oscillation
- Oscillogram
- Ostensorium
- Ostentation
- Osteoplasty
- Ostracoderm
- Outbreeding
- Outbuilding
- Outdistance
- Outdoorsman
- Outmaneuver
- Outsourcing
- Outstanding
- Ovariectomy
- Overachieve
- Overanxious
- Overarching
- Overbalance
- Overbearing
- Overcareful
- Overcasting
- Overcorrect
- Overdevelop
- Overexcited
- Overfatigue
- Overflowing
- Overgarment
- Overindulge
- Over-joyful
- Overnighter
- Overproduce
- Overprotect
- Overstretch
- Overweening
- Overwhelmed
- Overwrought
- Overzealous
- Oxalacetate
- Oxyhydrogen
- Ozonosphere
12 Letter Words that Start with O
- Obfuscations
- Objectifying
- Objectivisms
- Objectivists
- Objurgations
- Oblanceolate
- Oblatenesses
- Obligatorily
- Obligingness
- Obliterating
- Obliteration
- Obliterative
- Obliterators
- Obnubilating
- Obnubilation
- Obscurantism
- Obscurantist
- Obscurations
- Observations
- Obsolescence
- Obsoleteness
- Obstetrician
- Obstreperous
- Obstructions
- Obstructives
- Obtusenesses
- Occasionally
- Occupational
- Oceanography
- Octogenarian
- Octosyllable
- Officeholder
- Officialdoms
- Officialeses
- Officialisms
- Officiations
- Offishnesses
- Offscourings
- Oleaginously
- Oleandomycin
- Oleoresinous
- Olfactometer
- Oligarchical
- Oligochaetes
- Oligophagies
- Oligophagous
- Oligopsonies
- Oligotrophic
- Omnipotences
- Omnipotently
- Omnipresence
- Omnisciences
- Omnisciently
- Omnivorously
- Oncornavirus
- Onomatopoeia
- On-the-money
- Onychophoran
- Oophorectomy
- Open-hearted
- Opinionative
- Optimization
- Orchestrated
- Orchidaceous
- Organisation
- Organization
- Organoleptic
- Orienteering
- Orthodontics
- Orthogenesis
- Orthographic
- Orthopteroid
- Orthorhombic
- Orthotropous
- Oscillograph
- Oscilloscope
- Ossification
- Ostentatious
- Osteogenesis
- Osteomalacia
- Osteoplastic
- Osteoporosis
- Osteosarcoma
- Otherworldly
- Otosclerosis
- Outperformed
- Outplacement
- Overachiever
- Overbrimming
- Overcapacity
- Overcautious
- Overcritical
- Overestimate
- Overfamiliar
- Overgenerous
- Overinflated
- Overmedicate
- Overpersuade
- Overpopulate
- Overpowering
- Overpressure
- Overregulate
- Oversimplify
- Overwhelming
- Overwithhold
- Oxaloacetate
- Oxyacetylene
13 Letter Words that Start with O
- Objectionable
- Old-fashioned
- On-the-button
- Opportunities
- Outperforming
- Outstandingly
- Overcommitted
- Overconcerned
- Overconfident
- Overconscious
- Overconstruct
- Overconsuming
- Overcorrected
- Overcredulous
- Overdecorated
- Overdecorates
- Overdemanding
- Overdependent
- Overdesigning
- Overdeveloped
- Overdirecting
- Overdiscounts
- Overdiversity
- Overdocuments
- Overeagerness
- Overeducating
- Overeducation
- Overelaborate
- Overembellish
- Overencourage
- Overenergetic
- Overengineers
- Overestimated
- Overestimates
- Overexpanding
- Overexpansion
- Overexplained
- Overpromising
- Overpromoting
- Overprotected
- Overreactions
- Overregulated
- Overregulates
- Overreliances
- Overreporting
- Overresponded
- Oversaturated
- Oversaturates
- Oversecretion
- Oversensitive
- Overseriously
- Overservicing
- Overshadowing
- Overslaughing
- Overtightened
- Overtreatment
14 Letter Words that Start with O
- Open-heartedly
- Organizational
Learn more about list of words that start with n in English.
Words that Start with O | Examples
- He was very respectful at home and obedient to his parents.
- Try to be objective if you want to spend your money wisely.
- Facts can be established by observation and experiment.
- The role of scientists is to observe and describe the world, not to try to control it.
- The police are trying to obtain a more accurate picture of crime levels.
- Men were standing around, swilling beer and occasionally leering at passing females.
- The highest spring tides of the year occur after the equinoxes in March and September.
- The students return in October for the start of the new academic year.
- There have been several retirements in my office recently.
- Most software programs allow you to compose emails offline.
- The older generation prefer a darker and more traditional kind of clothing.
- In desperation, Mrs. Jones submitted to an operation on her right knee to relieve the pain.
- You must avail yourself of every opportunity to speak English.
- We will lay stress on industrial structure optimization while using FDI.
- The well-known singer was accompanied at the electronic organ by his school teacher.
- The organization is ever vigilant for threats to the habitats of birds.
- Tableware for outdoor use should ideally be unbreakable.
- The overall cost of the exhibition was £400,000.
- To make a lasting marriage we have to overcome self-centeredness.
- That city has decided to do away with overhead wires.
- The welfare of a child should always override the wishes of its parents.
- We’ve just appointed a coordinator who will oversee the whole project.
- Pulling out to overtake, the car collided head-on with a van.
- The document provides a general overview of the bank’s policies.
- She said insensitive things to the overweight woman.
- The owner has offered a reward for the recovery of the stolen goods.
Words that Start with O | Infographic
Words that Start with O | Infographic 1
Words that Start with O | Infographic 2
Ryder
Monday 1st of November 2021
hi
nico
Tuesday 25th of May 2021
jjm
noah
Monday 17th of May 2021
hi