sib vs relative

sib and relative both are nouns.

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

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

sib: one related by blood or origin; especially on sharing an ancestor with another
relative: a person related by blood or marriage

Other hypernyms of sib include relation.

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

Other hypernyms of sib include relation.

sib (noun)	relative (noun)
one related by blood or origin; especially on sharing an ancestor with another	an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus)
a person's brother or sister	a person related by blood or marriage

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