matrikin vs matrilineal kin

matrikin and matrilineal kin both are nouns.

Word	Noun	Adjective	Verb	Adverb
matrikin	Yes	No	No	No
matrilineal kin	Yes	No	No	No

As nouns, matrikin and matrilineal kin are synonyms defined as:

Other synonyms of matrikin include enate, matrilineal sib, matrisib.

matrikin (noun)	matrilineal kin (noun)
one related on the mother's side	one related on the mother's side