quintuplet vs quintette

quintuplet and quintette both are nouns.

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

As nouns, quintuplet and quintette are synonyms defined as:

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

Other synonyms of quintuplet include quintet, quintuple.

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