Nouns that Start with O
- oaf
- oarsman
- oarswoman
- obama
- objector
- oblate
- obliger
- oboist
- obscurantist
- observer
- obsessive
- obstetrician
- obstructionist
- obstructor
- occidental
- occult
- occultist
- occupant
- occupier
- oceanaut
- oceanographer
- octogenarian
- octoroon
- oculist
- odalisque
- oddball
- odist
- oenophile
- offender
- offerer
- offeror
- officeholder
- officer
- official
- officiant
- offspring
- ogler
- ogre
- ogress
- oiler
- oilman
- oldster
- oligarch
- olympian
- omani
- ombudsman
- omnivore
- onanist
- oncologist
- onlooker
- ono
- opener
- operagoer
- operative
- operator
- ophthalmologist
- opponent
- opportunist
- opposer
- opposite
- opposition
- oppressor
- ops
- optician
- optimist
- optometrist
- oracle
- orator
- orchestrator
- ordainer
- orderer
- orderly
- ordinand
- ordinary
- oread
- oregonian
- organiser
- organist
- organizer
- orientalist
- originator
- ornithologist
- orphan
- orthodontist
- orthoepist
- orthopedist
- oscan
- osculator
- osteologer
- osteologist
- osteopath
- ostiary
- ostler
- ostrich
- otolaryngologist
- otologist
- otorhinolaryngologist
- ottoman
- ouster
- outcast
- outcaste
- outdoorsman
- outfielder
- outfitter
- outlander
- outlaw
- outlier
- outpatient
- outrider
- outsider
- overachiever
- overcomer
- overlord
- overnighter
- overseer
- owner
- oxonian