raider

One who engages in a raid; a plunderer.

(business) A person who takes or attempts to take control of a firm against the will of current management by purchasing a controlling interest of stock and acquiring proxies.

(military) A special forces operative; a commando.

(military, naval) A warship which is light, maneuverable, and fast-moving.

A warplane on an air raid.

A law enforcement official who conducts a raid on a building in search for illicit goods.

(informal) A person who uncovers evidence of improper behavior within governmental or private organizations.