What is the meaning of Firer?

A person who fires a weapon; a shooter.

A person responsible for firing staff; a person who fires another.

A pyromaniac.

A person who fires pottery.

fourth (person or thing in the fourth position)

four (in dice or cards)

four (person or thing that is number four in a system, e.g.bus #4)

coxless four

present of fire

Source: wiktionary.org