quintuplet vs quin

quintuplet and quin both are nouns.

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

As nouns, quintuplet and quin are synonyms defined as:

quintuplet and quin: one of five children born at the same time from the same pregnancy

Other synonyms of quintuplet include quint.

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