Agent noun of father: one who fathers.

The state or quality of being a father.

One's spouse's father. / (dated) A stepfather.

The man from whom one inherits half of one's DNA and from whom men inherit their Y chromosome.

One who represents, behaves as, or is regarded as equivalent to a father for another person or group of people.

The chairperson or the senior shop steward of a trade union chapel (branch) in UK printing and journalism.

God or God the Father (in various Christian churches) / The title of the Pope of the Catholic Church.

A man who has adopted a child, as opposed to a biological father.

plural of father-in-law

A holiday in celebration of fatherhood, or to honor fathers, celebrated on the third Sunday of June in most of the world's countries. See Wikipedia:Father's Day:Dates.