matrilineal kin vs relative

matrilineal kin and relative both are nouns.

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

As nouns, relative is a hypernym of matrilineal kin; that is, relative is a word with a broader meaning than matrilineal kin:

Other hypernyms of matrilineal kin include relation.

matrilineal kin (noun)	relative (noun)
one related on the mother's side	an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus)
	a person related by blood or marriage

matrilineal kin (adjective)	relative (adjective)
	estimated by comparison; not absolute or complete
	properly related in size or degree or other measurable characteristics; usually followed by `to'