fivesome vs pentad

fivesome and pentad both are nouns.

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

As nouns, fivesome and pentad are synonyms defined as:

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

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

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