quintet vs quintuplet

quintet and quintuplet both are nouns.

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

As nouns, quintet and quintuplet are synonyms defined as:

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

Other synonyms of quintet include quintette, quintuple.

As nouns, quintet and quintuplet are synonyms defined as:

quintet and quintuplet: the cardinal number that is the sum of four and one

Other synonyms of quintet include 5, cinque, fin, five, fivesome, Little Phoebe, pentad, Phoebe, quint, V.

quintet (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
the cardinal number that is the sum of four and one