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.
To assist a patient with using the toilet and general personal hygiene.
A sink in a bathroom, connected to a supply of water and a drain, in which one may wash one's face and hands.
A basin for washing the face and hands; a washbasin.