日本語 Japanese Ask Questions Thread 8

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英語でも日本語でもOK
日本の方からのご協力も大歓迎です

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In my vocabulary studies, I've run across five (!) different ways to apparently say bathroom.
お手洗い
トイレ
洗面所
便所
化粧室

Are they more or less interchangeable, or do they have different nuances?  Like to me, 化粧室 seems more suited for a ladies' washroom, while トイレ seems rather blunt.  Thank you.