A person who writes, or produces literary work; an author can refer to themself as "the writer".
Anything that writes or produces output.
(finance) The seller of an option.
(historical) A clerk of a certain rank in the service of the East India Company, who, after serving a certain number of years, became a factor.
(Scotland) An ordinary legal practitioner in Scottish country towns.
(US) A petty officer in the United States navy who keeps the watch-muster and other books of the ship.
(slang) A graffiti artist.