Pirate
it means that a robber is on the high seas to kill people
crook robber, stealer
Another word for bandit or robber is "thief" or "outlaw."
Ghoul
Thief, robber, intruder.
ghoul
thief, bandit, fraud, burglar
This a good description for a pirate.
Independence of the Seas
ocean, sea, bay, gulf
The word buccaneer is a noun that means robber. Some synonyms for robber are Viking, pirate, rifler, corsair, and freebooter.
Bent; which doesn't sound as good as crooked.