wash-hand basin vs handbasin

wash-hand basin and handbasin both are nouns.

Word	Noun	Adjective	Verb	Adverb
wash-hand basin	Yes	No	No	No
handbasin	Yes	No	No	No

As nouns, wash-hand basin and handbasin are synonyms defined as:

Other synonyms of wash-hand basin include lavabo, washbasin, washbowl.

wash-hand basin (noun)	handbasin (noun)
a basin for washing the hands	a basin for washing the hands