A plumbing fixture for urination and defecation: a toilet.
Handwashing as an act, particularly
A laver: a washbasin.
A room containing a toilet: a bathroom (US) or WC (UK).
The ritual washing of hands after using the piscina to clean the communion vessels.
A plumbing fixture used for washing: a sink.
A piscina: the basin used for washing communion vessels.
A lavabo: the basin used for washing one's hands before handling the Eucharist.
The lavabo: the ritual washing of hands before handling the eucharist.
A baptismal font: the basin used for baptism, used figuratively for the washing away of sins.
A vessel or fixture for washing
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.