A lavatory: a room containing a toilet and (typically but not necessarily) a bathtub.
A room containing a shower and/or bathtub, and (typically but not necessarily) a toilet.
To assist a patient with using the toilet and general personal hygiene.
A lavatory intended for use by men, often including urinals in addition to toilets.
Other rooms intended for use by men, as waiting rooms, dressing rooms, locker rooms, etc.