kin vs relative

kin and relative both are nouns.

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

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

Other hypernyms of kin include relation.

kin (noun)	relative (noun)
group of people related by blood or marriage	an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus)
a person having kinship with another or others	a person related by blood or marriage

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