Freebooter
/ˈfriːbuːtər/
Definition 1 of 1
Pro Tip 1/3Historical Context
Used more in historical or fantasy settings to describe rogue characters similar to pirates. 
In our role-play game, Marina decided to be a freebooter, seeking treasure on the high seas.
Pro Tip 2/3Fear and Infamy
Connotes fear and notoriety, often carrying a negative view of the individual. 
The freebooter's silhouette struck terror in the hearts of the seafaring merchants.
Pro Tip 3/3Not Restricted to Sea
Remember, a freebooter can operate on land as well, unlike pirates who are typically sea-bound. 
The desert plains were once ruled by a fierce freebooter who preyed on caravans.