lavabo vs handbasin

lavabo and handbasin both are nouns.

Word	Noun	Adjective	Verb	Adverb
lavabo	Yes	No	No	No
handbasin	Yes	No	No	No

As nouns, lavabo and handbasin are synonyms defined as:

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

lavabo (noun)	handbasin (noun)
a basin for washing the hands	a basin for washing the hands