pentad vs fivesome

pentad and fivesome both are nouns.

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

As nouns, pentad and fivesome are synonyms defined as:

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

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

pentad (noun)	fivesome (noun)
the cardinal number that is the sum of four and one	five people considered as a unit
	the cardinal number that is the sum of four and one