father vs forefather

father and forefather both are nouns.

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

As nouns, father and forefather are synonyms defined as:

Other synonyms of father include sire.

father (noun)	forefather (noun)
a male parent (also used as a term of address to your father)	the founder of a family
the founder of a family	person from an earlier time who contributed to the tradition shared by some group
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

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