Nouns beginning with the vowel o (1,000)

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  • order
  • office
  • other
  • oil
  • opportunity
  • operation
  • opposition
  • officer
  • oxford
  • organisation
  • opinion
  • organization
  • offer
  • output
  • option
  • object
  • occasion
  • owner
  • outcome
  • offence
  • ownership
  • objective
  • origin
  • observation
  • oliver
  • occupation
  • obligation
  • official
  • ocean
  • oxygen
  • observer
  • operator
  • orchestra
  • opponent
  • outline
  • organ
  • oven
  • ozone
  • objection
  • orange
  • outlook
  • owl
  • occurrence
  • oz
  • orientation
  • outset
  • outbreak
  • offspring
  • opposite
  • overview
  • optimism
  • outfit
  • onset
  • ord
  • organism
  • overlap
  • oppression
  • oracle
  • onion
  • odour
  • organiser
  • orbit
  • oscar
  • obsession
  • outrage
  • obedience
  • obstacle
  • omission
  • ordeal
  • outsider
  • offender
  • outlet
  • original
  • oct
  • outside
  • offensive
  • outing
  • orchard
  • overall
  • otto
  • obstruction
  • oesophagus
  • ore
  • openness
  • objectivity
  • overtime
  • oxide
  • ordnance
  • occupier
  • orthodoxy
  • offeror
  • obituary
  • outburst
  • overdraft
  • ounce
  • onslaught
  • ombudsman
  • overflow
  • originality
  • orc
  • open
  • opener
  • os
  • outpatient
  • overthrow
  • overcoat
  • outcry
  • ordination
  • oesophagitis
  • olive
  • oval
  • overdose
  • ornament
  • occupancy
  • orient
  • overhaul
  • op.
  • overdrive
  • oblivion
  • onus
  • outlay
  • occupant
  • obscurity
  • octave
  • observance
  • observatory
  • obesity
  • optic
  • obscenity
  • oyster
  • orchid
  • opium
  • oligonucleotide
  • occult
  • old
  • organizer
  • oral
  • organist
  • otter
  • outflow
  • ovation
  • over
  • ox
  • op
  • oxidation
  • ollie
  • omeprazole
  • originator
  • orgasm
  • orphanage
  • octopus
  • oversight
  • overhead
  • overture
  • omen
  • omi
  • orphan
  • oscillation
  • oddity
  • orgy
  • obe
  • outcrop
  • overload
  • ordinance
  • omnibus
  • odyssey
  • opt-out
  • oratory
  • oboe
  • omega
  • orb
  • opus
  • outcast
  • odeon
  • octamer
  • oedema
  • ostrich
  • omelette
  • oxon
  • offshoot
  • officialdom
  • oestrogen
  • ointment
  • off-licence
  • ode
  • ordinary
  • offset
  • outbound
  • outreach
  • osteoporosis
  • overlord
  • opportunism
  • operand
  • overgrowth
  • oligarchy
  • ovulation
  • one-off
  • outpost
  • orator
  • objector
  • oda
  • optimist
  • obsolescence
  • objectification
  • overhang
  • oscillator
  • ovum
  • otherness
  • overseer
  • occlusion
  • onlooker
  • obiter
  • optician
  • obstinacy
  • octreotide
  • ornithology
  • ordinariness
  • outlaw
  • okapi
  • orchestration
  • ornamentation
  • oeuvre
  • ornithologist
  • offing
  • octagon
  • oriel
  • overspill
  • out-patient
  • oilfield
  • opulence
  • overkill
  • optimisation
  • opal
  • offal
  • oneness
  • ob
  • orang-utan
  • ochre
  • oversimplification
  • osmosis
  • outfall
  • outback
  • obs
  • om
  • opacity
  • orf
  • orderly
  • obverse
  • outhouse
  • ovary
  • oxidase
  • otaku
  • ooze
  • obelisk
  • orfe
  • operative
  • optimality
  • obsidian
  • ohm
  • operetta
  • ontology
  • ola
  • omnipotence
  • outgrowth
  • orifice
  • obstetrician
  • obliteration
  • osprey
  • overproduction
  • optimization
  • oilseed
  • ouija
  • one-year-old
  • outpouring
  • od
  • og
  • ogre
  • offworlder
  • oddness
  • onyx
  • oblong
  • oxo
  • opportunist
  • orthography
  • opiate
  • ostentation
  • oddball
  • oregano
  • oncology
  • oligo
  • overwork
  • orogeny
  • override
  • orderliness
  • overcapacity
  • overlordship
  • oratorio
  • omer
  • outfield
  • overpopulation
  • oe
  • oldman
  • oblast
  • oppressor
  • obfuscation
  • octane
  • orang
  • oleate
  • orienteering
  • ostracism
  • optimum
  • obex
  • outsole
  • oestrus
  • oligopoly
  • overgrazing
  • obeisance
  • olf
  • odium
  • overpayment
  • oscilloscope
  • okra
  • oration
  • ophthalmology
  • otitis
  • overtone
  • orbital
  • overstatement
  • orangery
  • offeree
  • orientalism
  • omniscience
  • oilskin
  • oceanography
  • off-chance
  • oliva
  • overshoot
  • outremer
  • oystercatcher
  • opprobrium
  • oliphant
  • orthopaedics
  • overrun
  • omicron
  • oldie
  • ordo
  • orogen
  • off-season
  • olivine
  • overcast
  • ottoman
  • okey
  • ormolu
  • oligodendrocyte
  • osh
  • objectivist
  • olympiad
  • outturn
  • obduracy
  • once-over
  • origination
  • overuse
  • outa
  • overestimate
  • oca
  • outbuilding
  • origami
  • osmolality
  • overtype
  • ostinato
  • ostler
  • outboard
  • obviousness
  • oviduct
  • ouster
  • ovipositor
  • ophiolite
  • oncogene
  • out-of-doors
  • oralism
  • osteoarthritis
  • ophthalmologist
  • oryx
  • orbiter
  • osteopath
  • organza
  • oximetry
  • olsalazine
  • overaccumulation
  • oxtail
  • organon
  • one-upmanship
  • oxygenation
  • operculum
  • overexpression
  • octavo
  • orangutan
  • ogle
  • openside
  • occultation
  • orca
  • osteopathy
  • onrush
  • ort
  • orthoptera
  • ogee
  • oilcloth
  • ordure
  • ouzo
  • oodles
  • oxidisation
  • outspokenness
  • obscurantist
  • octet
  • orefield
  • occurence
  • offspinner
  • outage
  • ossification
  • oomph
  • obscurantism
  • overbridge
  • over-consumption
  • obsequies
  • objectivism
  • ontogeny
  • one-liner
  • origo
  • obstructionism
  • osteonecrosis
  • odorant
  • otherworld
  • orde
  • ost
  • orangerie
  • opossum
  • omnipresence
  • overthrust
  • omnium
  • obbligato
  • overreaction
  • oracy
  • outer
  • outmigration
  • onomatopoeia
  • oxyhaemoglobin
  • outplacement
  • oligomer
  • offertory
  • omnipotent
  • oxytocin
  • ordinate
  • outrider
  • orvieto
  • overbalance
  • obloquy
  • opioid
  • oculist
  • obtuseness
  • oggy
  • osmium
  • ottar
  • osmolarity
  • oblique
  • occultism
  • oocyte
  • orchestrator
  • octahedron
  • obit
  • oranda
  • overestimation
  • orgone
  • overlooker
  • overmantel
  • oiliness
  • oilman
  • overindebtedness
  • overdetermination
  • ovoid
  • occiput
  • overtrousers
  • one-piece
  • overemphasis
  • oralist
  • orality
  • oboist
  • orrery
  • owre
  • organicist
  • old-timer
  • overexertion
  • orgel
  • ocelot
  • occidental
  • ordinand
  • overdevelopment
  • outrigger
  • orthogenesis
  • octogenarian
  • outwork
  • overdosage
  • openwork
  • oka
  • outlawry
  • oliguria
  • oversteer
  • oolite
  • outfitter
  • oche
  • offense
  • ology
  • offensiveness
  • oppo
  • open-mindedness
  • optoelectronics
  • oppositeness
  • osmometer
  • odometer
  • obliquity
  • operability
  • okay
  • oestradiol
  • org
  • out-relief
  • out-turn
  • orris
  • oceanographer
  • oik
  • offchance
  • overexploitation
  • octavius
  • optimiser
  • oleander
  • overindulgence
  • organogenesis
  • oxy
  • optometrist
  • oiticica
  • oxyacetylene
  • overtreatment
  • overdraught
  • opacification
  • ower
  • oncologist
  • overarm
  • one-sidedness
  • obstructionist
  • oke
  • orchestre
  • okimono
  • offside
  • off-roader
  • overstimulation
  • out-tray
  • osteospermum
  • organdie
  • operon
  • ossuary
  • odalisque
  • ontogenesis
  • ovine
  • out
  • ogi
  • oba
  • orientalist
  • ocker
  • overcharge
  • okada
  • orogenesis
  • oxbow
  • overinvolvement
  • onchocerciasis
  • oppositionist
  • occultist
  • orosomucoid
  • organophosphate
  • operant
  • oesophagectomy
  • oncoprotein
  • oubliette
  • odontoid
  • omerta
  • ouguiya
  • oceanarium
  • oul
  • offtake
  • oidium
  • orang-outang
  • organelle
  • outperformance
  • off-worlder
  • offcut
  • overexposure
  • orangutang
  • outgroup
  • onanism
  • overfishing
  • overflight
  • outro
  • officership
  • oriflamme
  • oyer
  • optronics
  • overreach
  • ophthalmoscope
  • ouzel
  • overspecialization
  • oppressiveness
  • occupance
  • oriole
  • overvaluation
  • oprichnina
  • overcommitment
  • opaqueness
  • oesophagogastroduodenoscopy
  • on
  • oxidant
  • oligarch
  • overconfidence
  • outerwear
  • osteosarcoma
  • outfielder
  • organum
  • oompah
  • octapeptide
  • organicism
  • oversubscription
  • oxymoron
  • opticals
  • ortho
  • outstation
  • orangeade
  • osha
  • over-excitement
  • overfamiliarity
  • outrageousness
  • outrance
  • offerer
  • oppidum
  • oblate
  • oden
  • obsessiveness
  • obligatoriness
  • optometry
  • otalgia
  • officialese
  • outland
  • osmometry
  • officiant
  • orbitosphenoid
  • oleoyl
  • omphalos
  • octopussy
  • opalescence
  • outliner
  • opaline
  • owings
  • obstructiveness
  • omentum
  • overlayer
  • oxygenase
  • otherworldliness
  • operationalization
  • orchis
  • operatorship
  • oximeter
  • overplus
  • ornamenter
  • outport
  • overexpansion
  • oculus
  • orthopyroxene
  • obscuration
  • oversupply
  • ogam
  • otolaryngology
  • ocarina
  • obsequiousness
  • oxocarbon
  • oloroso
  • oilbird
  • oldness
  • oilcan
  • outswinger
  • oviposition
  • oxyrhynchus
  • occident
  • overdependence
  • outcaste
  • open-handedness
  • oblation
  • otoscopy
  • open-side
  • overprotection
  • overactivity
  • obligato
  • omnivore
  • origanum
  • obdurateness
  • openmindedness
  • outlands
  • outdatedness
  • ouvrier
  • orzo
  • obeche
  • officiousness
  • offie
  • oper
  • oth
  • one-nighter
  • oncogenesis
  • obliqueness
  • obliquus
  • ovalbumin
  • oxfendazole
  • osteomalacia
  • olfaction
  • overrepresentation
  • osteomyelitis
  • overstability
  • owlet
  • ozokerite
  • oncovin
  • orl
  • ondansetron
  • obnoxiousness
  • operationalism
  • orthophosphate
  • oscillograph
  • olivet
  • obol
  • overconsumption
  • okrug
  • ossia
  • overstrike
  • oikos
  • osculation
  • ornamentalism
  • olla
  • overwrap
  • ommatidium
  • ostiole
  • ostmark
  • opticks
  • oner
  • omnicompetence
  • oversensitivity
  • oxalis
  • ostracization
  • oribi
  • outbreeding
  • osier
  • overtaxation
  • overman
  • oiler
  • oldster
  • overprint
  • orthodontist
  • offhandedness
  • oilrig
  • open-heartedness
  • overabundance
  • outhaul
  • ogonek
  • overprotectiveness
  • olecranon
  • overprovision
  • ophthalmia
  • overskirt
  • octofoil
  • ordre
  • oligosaccharide
  • obduction
  • oversman
  • obligor
  • overtrading
  • oxblood
  • oleo
  • osteogenesis
  • orthogonality
  • overdoor
  • oxyanion
  • orebody
  • outlandishness
  • oxybutynin
  • oropharynx
  • osmoregulation
  • oxer
  • overfunding
  • odonatist
  • overspender
  • octopush
  • olestra
  • outdoorsman
  • osteology
  • oleum
  • osteoma
  • overreliance
  • overspray
  • orache
  • overeater
  • oogenesis
  • opry
  • overcompensation
  • omelet
  • odontologist
  • oesophagogram
  • oesophagoscopy
  • ovariotomy
  • onomastics
  • overpass
  • orchestrion
  • obeyance
  • overconcentration
  • overwhelm
  • obi
  • ovenware
  • overlength
  • overbite
  • olivewood
  • outspan
  • obituarist
  • oxidoreductase
  • off-white
  • oolong
  • oflag
  • oxime
  • overworld
  • overcorrection
  • old-school
  • oneiromancy
  • overhearer
  • ornateness
  • ocellus
  • overlock
  • oxalate
  • oversensitiveness
  • oby
  • onerousness
  • osteitis
  • ornithischian
  • objectiveness
  • oecology
  • outgate
  • orichalcum
  • ostension
  • overprescription
  • observability
  • ostranenie
  • off
  • oldstyle
  • oligomenorrhoea
  • odd-bod
  • oppertunity
  • optionality
  • orthodontics
  • osteoarcheologist
  • overshirt
  • ornithopter
  • observator
  • overinclusion
  • overthrowal
  • otosclerosis
  • optocoupler
  • oilstone
  • oilwell
  • ovolo
  • open-work
  • oink
  • outwash
  • opposability
  • oni
  • ogress
  • overdispersion
  • one-dayer
  • obligee
  • oyl
  • orbita
  • orthogneiss
  • ojha
  • outworker
  • ovule
  • outworld
  • outfielding
  • obsoleteness
  • officialism
  • overinvestment
  • ovulum
  • overtrick
  • oligospermia
  • oxcart
  • otterskin
  • obeah
  • outseam
  • oleograph
  • opuntia
  • oenology
  • onlap
  • organology
  • one-itis
  • ouvert
  • onlay
  • ouvriere
  • overclothing
  • ophthalmoscopy
  • ombre
  • obediency
  • oligotrophication
  • overanxiety
  • one-of-a-kind
  • osmose
  • oxeye
  • orbivirus
  • opah
  • overgarment
  • octopole
  • only
  • ohana
  • overdub
  • overgeneralization
  • offload
  • overcollection
  • ombudsperson
  • osteolysis
  • orotundity
  • orthomorphism
  • osmotherapy
  • oliphaunt
  • orcein
  • oleyl
  • orenda
  • one-shot
  • oppy
  • oroya
  • offramp
  • ouabain
  • overearnestness
  • opine
  • omul
  • osmunda
  • orcharding
  • overvoltage
  • oxyfluoride
  • oncomouse
  • ovangkol
  • overglaze
  • olfactometer
  • obliviousness
  • octadecyl
  • obstructor
  • opsimath
  • overgo
  • off-license
  • operatics
  • outsiderhood
  • opsin
  • oxhide
  • owling
  • olfactory
  • oncost
  • orchestra-pit
  • ozonation
  • octaeteris
  • orthopaedist
  • overwatch
  • oncostatin
  • opcode
  • overbar
  • oxicam
  • opsonisation
  • osteopenia
  • overwear
  • operating-system
  • orpharion
  • ozonesonde
  • oughtness
  • out-of-towner
  • overweening
  • octyl
  • odor
  • outskirt
  • orthopedics
  • octal
  • oestriol
  • onomatopeia
  • outer-space
  • oceanfront
  • ozoniser
  • outercoat
  • overconcern
  • operationalisation
  • out-swinger
  • oxygenator
  • orchidectomy
  • out-thereness
  • overhand
  • owner-operator
  • obtrusiveness
  • orpin
  • overruler

Note: these words have been obtained from Wiktionary and have been classified and improved through automated computer linguistics processes.

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