WordNet sense 1 (a bathroom sink that is permanently installed and connected to a water supply and drainpipe; where you can wash your hands and face):

basin, washbasin, washbowl, washstand

WordNet sense 2 (a room or building equipped with one or more toilets):

bathroom, can, john, privy, toilet, lav

WordNet sense 3 (a toilet that is cleaned of waste by the flow of water through it):

flush toilet