sept vs phratry

sept and phratry both are nouns.

Word	Noun	Adjective	Verb	Adverb
sept	Yes	No	No	No
phratry	Yes	No	No	No

As nouns, sept and phratry are synonyms defined as:

Other synonyms of sept include family, family line, folk, kinfolk, kinsfolk.

sept (noun)	phratry (noun)
people descended from a common ancestor	people descended from a common ancestor