observator
An observer.

observators
plural of observator

observee
One who is observed.

observees
plural of observee

observer
One who makes observations, monitors or takes notice.
One who adheres or follows laws, guidelines, etc.
A person sent as a representative, to a meeting or other function to monitor but not to participate.
A country or other entity which has limited participation rights within an organization.
A crew member on an aircraft who makes observations of enemy positions or aircraft.
A sentry etc. manning an observation post.
Synonym of spotter.

observeress
A female observer.

observeresses
plural of observeress

observers
plural of observer

obsessee
One who is the object of someone's obsession.

obsessees
plural of obsessee

obsessionist
A person who has an obsession; an obsessive.

obsessionists
plural of obsessionist

obsessives
plural of obsessive

obsessor
One who is obsessive about something.

obsessors
plural of obsessor

obsonator
A caterer, a manciple.

obstetrician
A physician who specializes in childbirth.

obstetricians
plural of obstetrician

obstetrist
An obstetrician.

obstetrix
A midwife.

obstructer
Agent noun of obstruct: someone who obstructs.

obstructers
plural of obstructer

obstructionists
plural of obstructionist

obstructives
plural of obstructive

obstructor
Alternative form of obstructer.

obstructors
plural of obstructor

obtainer
One who obtains.

obtainers
plural of obtainer

obtruder
Someone who obtrudes.

obtruders
plural of obtruder

oburoni
A foreigner, especially one who is white.

oburonis
plural of oburoni.

obviator
One who obviates.

obviators
plural of obviator

ocarinist
Someone who plays the ocarina.

ocarinists
plural of ocarinist

occasionalist
A proponent of occasionalism.

occasionalists
plural of occasionalist

occasionals
plural of occasional

occasioner
Agent noun of occasion; one who occasions

occasioners
plural of occasioner

occidentalist
One who studies occidental languages.
A person who favours Western ideas or customs.

occidentalists
plural of occidentalist

occifer
Alternative spelling of ossifer.

occultist
A person who practises or studies occultism; a practitioner of, or person learned in, the occult.

occultists
plural of occultist

occupant
A person who occupies an office or a position.
A person who occupies a place.
A person who occupies a place.
The owner or tenant of a property.

occupants
plural of occupant

occupationalists
plural of occupationalist

occupier
One who occupies, particularly with respect to a foreign government controlling the territory of another.

occupiers
plural of occupier

occurrents
plural of occurrent; events

oceanaut
An explorer in a submarine.
Someone who lives or does scientific work underwater.

oceanauts
plural of oceanaut

oceanfarer
Someone who travels on the ocean

oceanfarers
plural of oceanfarer

oceanographer
a person who studies oceanography, the science of oceans

oceanographers
plural of oceanographer

oceanographist
An oceanographer.

oceanographists
plural of oceanographist

oceanologist
One who studies oceanology.

oceanologists
plural of oceanologist

ochlagogue
A manipulator of a mob who holds sway by use of inflammatory rhetoric, casting opprobrium, and by appeal to the lowest common denominator generally; an extreme and wholly unscrupulous demagogue; one who practises ochlagogy.

ochlagogues
plural of ochlagogue

ochlocrat
An adherent of the principle of ochlocracy; an advocate of mob rule.

ochlocrats
plural of ochlocrat

ochlophobe
A person having a fear of crowds.

ochlophobes
plural of ochlophobe

ochlophobiac
Synonym of ochlophobe.

ochlophobiacs
plural of ochlophobiac

ochlophobist
A person with a phobia, or fear, of mob-like crowds, as opposed to simply open spaces like agoraphobia or large crowds as with enochlophobia.

ochlophobists
plural of ochlophobist

ockerer
A usurer.

ockerers
plural of ockerer

ocnophil
A personality type characterised by avoidance of dangerous of unfamiliar situations, and the reliance on other people for security.

ocnophils
plural of ocnophil

octagonian
Relating to an octagon

octathlete
Competitor in an octathlon.

octillionaire
Somebody whose wealth is at least one octillion (10²⁷) currency units.

octillionaires
plural of octillionaire

octobassist
Someone who plays the octobass.

octobassists
plural of octobassist

octopusher
Someone who plays octopush.

octopushers
plural of octopusher

octoroon
Someone having one-eighth black ancestry.
Someone having 1/64th black ancestry: the child of a quintoon and a white man.

octoroons
plural of octoroon

octovir
Any member of a group of eight officials.

octovirate
A group of eight people, especially (politics) a council of eight men who share office or rule.

octovirates
plural of octovirate

octoviri
plural of octovir

octovirs
plural of octovir

ocularist
Someone who specializes in the fabrication and fitting of ocular prostheses for people who have lost an eye or eyes due to trauma or illness.

ocularists
plural of ocularist

oculist
An eye doctor; an ophthalmologist or optometrist.

oculists
plural of oculist

odaller
Alternative form of udaller.

odallers
plural of odaller

odalman
A man having odal, or able to share in it by inheritance.

odalmen
plural of odalman

oddbod
Alternative spelling of odd bod.

oddbods
plural of oddbod

oddling
One who is odd or eccentric; an oddball.

oddlings
plural of oddling
The particulars, as leading to a certain outcome.

oddman
Alternative form of odd man (“one who does odd jobs”).

oddmen
plural of oddman

oddment
A part of something that is left over, such as a piece of cloth.
Something that does not match the things it is with or cannot easily be categorized; a miscellaneous item.
An item that was originally part of a set but is sold individually; an excess item of stock.
A part of a book that is not a portion of the text, such as the title, index, etc. (usually plural).
A person who does not fit in with others or is considered to be strange in some way.
A varied collection (of items).
A remaining number or amount (after a calculation).
Something strange or unusual.

oddments
plural of oddment

oddsmaker
A person who sets odds for gambling.

oddsmakers
plural of oddsmaker

oddsman
A person who offers odds to gamblers.

oddsmen
plural of oddsman

odist
A writer of an ode or odes.

odists
plural of odist

odonatist
One who studies dragonflies or damselflies.

odonatists
plural of odonatist

odonatologist
One who studies odonatology.

odonatologists
plural of odonatologist

odontist
dentist

odontists
plural of odontist

odontogram
A diagrammatic representation of a person's teeth

odontograms
plural of odontogram

odontologist
A specialist in odontology.

odontologists
plural of odontologist

odontophobics
plural of odontophobic

odylist
A believer in odylism.

odylists
plural of odylist

oeconomi
plural of oeconomus

oeconomus
A married priest (chiefly Orthodox Christian and Uniate usage), as opposed to a hieromonk.
A priest or other person who serves as the bursar or finance officer of a diocese or religious institution (chiefly Roman Catholic usage), an episcopal oeconomus temporarily takes charge of church property in the event of an episcopal vacancy.
A Byzantine title given to the chief steward or treasurer of a household or institution.

oenaphile
Misspelling of oenophile.

oenologist
An expert in the science of oenology.

oenologists
plural of oenologist

oenomaniac
One who is affected by oenomania, a morbid desire for wine; an alcoholic.

oenomaniacs
plural of oenomaniac

oenophil
Dated form of oenophile.

oenophile
A person who has a fondness or appreciation for wine.

oenophiles
plural of oenophile

oenophils
plural of oenophil

ofan
Alternative form of ophan.

ofanim
plural of ofan

offbeats
plural of offbeat

offcomer
A newcomer to a place.

offcomers
plural of offcomer

offcumden
Someone not from the area; an incomer, an outsider.

offcumdens
plural of offcumden