You forgot: Washroom. Lavatory. Outhouse. Mens' room. Little girls' room room. Potty. Half bath. And many more (mostly NSFHN). I suspect there's a deep reason

You forgot: Washroom. Lavatory. Outhouse. Mens' room. Little girls' room room. Potty. Half bath. And many more (mostly NSFHN). I suspect there's a deep reason for all the different words, probably because of the basic nature of what goes on within such rooms. I wouldn't be surprised if other languages have the same profusion of synonyms.