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toilet / bathroom
In BrE, but not in AmE, the room that has a toilet in it is usually referred to as a toilet. This room in people''s houses can also be called the lavatory, or informally, the loo. An extra downstairs toilet in a house can be called the cloakroom. In public places, especially on signs, the words toilets, Gents (for men''s toilets) or Ladies (for women''s toilets) are used for a room or small building containing several toilets. You might also see WC or Public Conveniences on some signs.
In AmE the room that contains a toilet is usually called the bathroom, never the toilet. A room with a toilet in a public place can also be called a restroom, ladies'' room, women''s room or men''s room. Washroom is an old-fashioned word.
Oxford Advanced Learner''s Dic.