A Gunner

1. (military) Artillery soldier, or such who holds private rank. Abbreviated Gnr.
2. A person who operates a gun.
3. (figurative) An excessive go-getter; one exhibiting over-ambition.
4. (American football) A player on the kicking team whose primary job is to tackle the kickoff returner or punt returner.
5. (Britain, slang, soccer) A fan of the Arsenal Football Club.
6. The great northern diver or loon.
7. (Britain, Ireland, dialect) The sea bream, especially Pagellus bogaraveo (blackspot sea bream)
8. (basketball) A player who can reliably shoot baskets.