optant
A person who lives in a region undergoing a change of sovereignty and thus may choose between retaining their old citizenship or opting for the citizenship of the new sovereignty.
A person who opts into, out of, or for something.

optants
plural of optant

optician
A person who makes, dispenses or sells lenses, spectacles.
A person trained and skilled in examining and testing the eyes for defects, in order to prescribe corrective lenses or treatment; an optometrist.

opticians
plural of optician
An optometry practice.

opticist
One who studies optics.

opticists
plural of opticist

optime
A student who graduates with second class ("senior optime") or third class ("junior optime") honours in mathematics, or (loosely) in any other subject.

optimes
plural of optime

optimiser
Alternative spelling of optimizer.

optimisers
plural of optimiser; alternative spelling of optimizer.

optimist
A person who expects a favourable outcome.
A believer in optimism.

optimists
plural of optimist

optimizer
A person in a large business whose task is to maximize profits and make the business more efficient.
A program that uses linear programming to optimize a process.
A compiler or assembler that produces optimized code.

optimizers
plural of optimizer

optionaire
A person whose wealth consists of or was made through stock options.
A person who has been afforded greater opportunities by having been born into privilege.

optionaires
plural of optionaire

optionee
The purchaser of a financial option.

optionees
plural of optionee

optionor
The grantor of a financial option.

optionors
plural of optionor

optocoupler
An optoisolator.

optocouplers
plural of optocoupler

optologist
One who studies optology.

optologists
plural of optologist

optometrist
A person trained and skilled in examining and testing the eyes for defects, in order to prescribe corrective lenses or treatment.

optometrists
plural of optometrist

oralist
A supporter of oralism.

oralists
plural of oralist

oralizer
One who oralizes.

oralizers
plural of oralizer

orancaya
Alternative form of orankay.

orancayas
plural of orancaya

orangette
A candied orange peel, usually covered in dark or milk chocolate.

orangettes
plural of orangette

orangie
A pro-British Ulster Protestant.

orankay
In the Malay Archipelago, a person of distinction, a chief or noble.

orankays
plural of orankay

orarians
plural of orarian

orator
Someone who orates or delivers an oration.
A skilled and eloquent public speaker.
Someone sent to speak for someone else; an envoy, a messenger.
A petitioner, a supplicant.

oratoress
Alternative form of oratress.

oratoresses
plural of oratoress

orators
plural of orator

oratour
Obsolete form of orator.

oratours
plural of oratour

oratress
A female orator

oratresses
plural of oratress

orbiter
An object that orbits another, especially a spacecraft that orbits a planet etc. without landing on it.
A person who constantly hangs around with someone they are attracted to, but too shy to talk to.

orbiters
plural of orbiter

orcharder
One who owns or operates an orchard.

orcharders
plural of orcharder

orchardist
One who owns or operates an orchard.

orchardists
plural of orchardist

orchardman
A man who owns or tends an orchard.

orchardmen
plural of orchardman

orchidist
A person who cultivates orchids.

orchidists
plural of orchidist

orchidologist
One who studies orchids.

orchidologists
plural of orchidologist

orchidomaniac
A person who is passionate about collecting or raising orchids.

orchidomaniacs
plural of orchidomaniac

orchidophile
An orchid enthusiast.

orchidophiles
plural of orchidophile

ordainee
One who is ordained.

ordainees
plural of ordainee

ordainer
A person (usually a clergyman) who ordains.

ordainers
plural of ordainer

orderer
A person who orders, or who places an order

orderers
plural of orderer

ordinand
A candidate for ordination.

ordinants
plural of ordinant

ordinariate
The office of a Roman Catholic ordinary, especially a bishop.

ordinariates
plural of ordinariate

ordinaries
plural of ordinary

ordinator
One who ordains or establishes; a director.

ordinators
plural of ordinator

ordinee
Alternative form of ordainee.

ordinees
plural of ordinee

ordnanceman
A person responsible for storing, maintaining, and handling ordnance.

ordnancemen
plural of ordnanceman

ordoliberalist
A proponent of ordoliberalism.

ordoliberalists
plural of ordoliberalist

oreologist
Alternative form of orologist.

oreologists
plural of oreologist

organbuilder
A person who makes organs (musical instruments).

organbuilders
plural of organbuilder

organicist
An advocate of organicism.

organicists
plural of organicist

organiser
Non-Oxford British English standard spelling of organizer.

organisers
plural of organiser

organist
A musician who plays the organ.

organists
plural of organist

organizer
A person who arranges the details of a public event.
A hand-held micro-computer that will perform specific tasks; can be used as an electronic diary, alarm clock, recorder of memos and notes, a portable database etc.
A non-electronic notebook or calendar or something similar, used to organize one's affairs.
A group of cells that, together with the evocator, control differentiation in the embryo; the inductor
a recipient, such as a box or a case, used for storing gadgets, trinkets and other knick-knacks; an organizer box

organizers
plural of organizer

organlegger
Someone who illegally harvests and sells human organs.

organleggers
plural of organlegger

organmaker
A person who makes organs (musical instruments).

organmakers
plural of organmaker

organogenist
A proponent of organogeny.

organogenists
plural of organogenist

organographer
One who studies organography.

organographers
plural of organographer

organographist
Someone knowledgeable in organography.

organographists
plural of organographist

organologist
One who studies organology.

organologists
plural of organologist

orgasmer
A person who orgasms

orgasmers
plural of orgasmer

orgiast
One who attends an orgy.
One who is prone to excessive indulgence.

orgiasts
plural of orgiast

orgygoer
Alternative form of orgy-goer.

orgygoers
plural of orgygoer

orientals
plural of oriental

orienteerer
A participant in the sport of orienteering.

orienteerers
plural of orienteerer

orienter
A person or thing that orients.

orienters
plural of orienter

origamist
A person who does origami.

origamists
plural of origamist

originalist
One who has, or tends to have, original ideas.
One who aims to discover how the writers of a document intended it to be interpreted, and to interpret it in that way.
One who aims to discover how the writers of a document intended it to be interpreted, and to interpret it in that way.
One who aims to discover how the writers of a document intended it to be interpreted, and to interpret it in that way.

originalists
plural of originalist

originaries
plural of originary

originator
Someone who originates, creates or founds something.

originators
plural of originator

originatress
A female originator.

originatresses
plural of originatress

originatrix
A female originator.

orismologist
One who can explain technical terms; a person who engages in orismology.

orismologists
plural of orismologist

orkoiik
plural of orkoiyot

orkoiyot
A spiritual king and military leader of the Nandi and Kipsigis people of Kenya.

orkoiyots
plural of orkoiyot

orlay
Fate, destiny.

ornamentalist
An artist who favours an ornamental style.

ornamentalists
plural of ornamentalist

ornamenter
Someone who ornaments; a decorator.

ornamenters
plural of ornamenter

ornamentist
One who ornaments; a decorator.

ornamentists
plural of ornamentist

ornamentor
One who ornaments.

ornamentors
plural of ornamentor

ornatrix
A tirewoman, an adorner.

ornithogeographer
One who studies ornithogeography.

ornithogeographers
plural of ornithogeographer

ornithologer
An ornithologist.

ornithologers
plural of ornithologer