Little Phoebe vs quintuplet

Little Phoebe and quintuplet both are nouns.

Word	Noun	Adjective	Verb	Adverb
Little Phoebe	Yes	No	No	No
quintuplet	Yes	No	No	No

As nouns, Little Phoebe and quintuplet are synonyms defined as:

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

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

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