bathroom
Pronunciation:
/ˈbæθ.ɹuːm//ˈbæθ.ɹuːm/noun
Definitions
A room containing a shower and/or bathtub, and (typically but not necessarily) a toilet.
A lavatory: a room containing a toilet and (typically but not necessarily) a bathtub.
Example: Most Americans don't know 'WC' and many Brits mock 'bathroom' but almost everyone understands 'toilet' or 'lavatory'.