antecedent vs forebear

antecedent and forebear both are nouns.

Word	Noun	Adjective	Verb	Adverb
antecedent	Yes	Yes	No	No
forebear	Yes	No	No	No

As nouns, forebear is a hyponym of antecedent; that is, forebear is a word with a more specific, narrower meaning than antecedent:

antecedent: someone from whom you are descended (but usually more remote than a grandparent)
forebear: a person from whom you are descended

Other hyponyms of antecedent include ancestress, forbear, father, forefather, sire, foremother, primogenitor, progenitor.

antecedent (noun)	forebear (noun)
the referent of an anaphor; a phrase or clause that is referred to by an anaphoric pronoun	a person from whom you are descended
a preceding occurrence or cause or event
someone from whom you are descended (but usually more remote than a grandparent)
anything that precedes something similar in time

antecedent (adjective)	forebear (adjective)
preceding in time or order