ancestor vs father

ancestor and father both are nouns.

Word	Noun	Adjective	Verb	Adverb
ancestor	Yes	No	No	No
father	Yes	No	Yes	No

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

ancestor: someone from whom you are descended (but usually more remote than a grandparent)
father: the founder of a family

Other hyponyms of ancestor include ancestress, forbear, forebear, forefather, sire, foremother, primogenitor, progenitor.

ancestor (noun)	father (noun)
someone from whom you are descended (but usually more remote than a grandparent)	a male parent (also used as a term of address to your father)
	the founder of a family
	a person who holds an important or distinguished position in some organization
	a person who founds or establishes some institution
	the head of an organized crime family

ancestor (verb)	father (verb)
	make (offspring) by reproduction