father vs sire

father and sire both are nouns.

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

As nouns, father and sire are synonyms defined as:

Other synonyms of father include forefather.

As verbs, father and sire are synonyms defined as:

Other synonyms of father include beget, bring forth, engender, generate, get, mother.

father (noun)	sire (noun)
a male parent (also used as a term of address to your father)	male parent of an animal especially a domestic animal such as a horse
the founder of a family	the founder of a family
a person who holds an important or distinguished position in some organization	a title of address formerly used for a man of rank and authority
a person who founds or establishes some institution
the head of an organized crime family

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