quintette vs quintuplet

quintette and quintuplet both are nouns.

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

As nouns, quintette and quintuplet are synonyms defined as:

quintette and quintuplet: a set of five similar things considered as a unit

Other synonyms of quintette include quintet, quintuple.

quintette (noun)	quintuplet (noun)
a musical composition for five performers	a set of five similar things considered as a unit
five people considered as a unit	one of five children born at the same time from the same pregnancy
a set of five similar things considered as a unit	the cardinal number that is the sum of four and one
five performers or singers who perform together