privateer -
An officer or any other member of the crew of such a ship.
privateer -
A private individual entrant into a race or competition who does not have the backing of a large, professional team.
Verb
privateer -
To function under official sanction permitting attacks on enemy shipping and seizing ship and cargo; to engage in government-sponsored piracy.
Wikipedia
A privateer was a private person or private warship authorized by a country's government by letters of marque to attack foreign shipping. Privateers were only entitled by their state to attack and rob enemy vessels during wartime. Privateers were part of naval warfare of some nations from the 16th to the 19th century.