matrilineal kin vs matrikin

matrilineal kin and matrikin both are nouns.

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

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

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

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