offspring vs relative

offspring and relative both are nouns.

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

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

Other hypernyms of offspring include relation.

offspring (noun)	relative (noun)
any immature animal	an animal or plant that bears a relationship to another (as related by common descent or by membership in the same genus)
something that comes into existence as a result	a person related by blood or marriage
the immediate descendants of a person

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