lavatory

noun

toilet, bathroom, facilities, urinal, privy, latrine, outhouse;

British WC, water closet, earth closet, public convenience, cloakroom, powder room;

North American washroom, rest room, men's room, ladies' room, commode, comfort station;

Philippines comfort room;

French pissoir;

Nautical head;

informal little girls' room, little boys' room, smallest room;

British, informal loo, bog, the Ladies, the Gents, khazi, lav, throne, thunderbox;

Northern English, informal netty;

North American, informal can, john, honey bucket;

Australian, New Zealand, informal dunny, little house;

vulgar slang pisser, shithouse, shitter;

archaic jakes, closet, garderobe.

lavatory Oxford Dictionary of English