fivesome vs quintette

fivesome and quintette both are nouns.

Word	Noun	Adjective	Verb	Adverb
fivesome	Yes	No	No	No
quintette	Yes	No	No	No

As nouns, fivesome and quintette are synonyms defined as:

Other synonyms of fivesome include quintet.

fivesome (noun)	quintette (noun)
five people considered as a unit	a musical composition for five performers
the cardinal number that is the sum of four and one	five people considered as a unit
	a set of five similar things considered as a unit
	five performers or singers who perform together