string quintet vs quintette

string quintet and quintette both are nouns.

Word	Noun	Adjective	Verb	Adverb
string quintet	Yes	No	No	No
quintette	Yes	No	No	No

As nouns, quintette is a hypernym of string quintet; that is, quintette is a word with a broader meaning than string quintet:

Other hypernyms of string quintet include quintet.

string quintet (noun)	quintette (noun)
a group of five string players.	a musical composition for five performers
	five people considered as a unit
	a set of five similar things considered as a unit
	five performers or singers who perform together