handbasin vs lavabo

handbasin and lavabo both are nouns.

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

As nouns, handbasin and lavabo are synonyms defined as:

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

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