Freebooter (noun)

A pirate or privateer who operates without legal authority, typically in search of treasure or other valuable resources.

Origin:

From the dutch word "vrijbuiter" meaning pirate, who plunders without any legal authority.

Examples:

1. The freebooters plundered the ships that passed through the Caribbean Sea.
2. The freebooters were notorious for their ruthless attacks on merchant ships.
3. He was accused of being a freebooter and a pirate by the local authorities.
4. The freebooters were considered as outcasts and criminals by the society.
5. Freebooters were often employed by European countries to attack the ships of their enemies.