Little Phoebe vs pentad

Little Phoebe and pentad both are nouns.

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

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

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

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

Little Phoebe (noun)	pentad (noun)
the cardinal number that is the sum of four and one	the cardinal number that is the sum of four and one