stunner

1. Anything that is stunning. (colloquial)
2. A woman or man of stunning beauty or handsomeness (often hyperbolic), a knockout. (colloquial)
3. A professional wrestling maneuver in which an attacking wrestler applies a facelock to an opponent and falls to a seated position, forcing the opponent's jaw or neck to drop on the attacker's shoulder.
4. A pistol firing a beam capable of stunning an enemy.
5. A person or machine that stuns an animal before slaughter.

Plural stunners