fivesome vs quintuplet

fivesome and quintuplet both are nouns.

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

As nouns, fivesome and quintuplet are synonyms defined as:

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

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

fivesome (noun)	quintuplet (noun)
five people considered as a unit	a set of five similar things considered as a unit
the cardinal number that is the sum of four and one	one of five children born at the same time from the same pregnancy
	the cardinal number that is the sum of four and one