The term 'Lawless Adventurer' is a fitting description for the job of a FREEBOOTER, which is a 10-letter word. A FREEBOOTER is a person who engages in acts of piracy or plundering, often on the high seas. They are also known as privateers, buccaneers, or corsairs. Freebooters were often employed by governments to attack enemy ships and seize their cargo, but they were also known to engage in their own independent raids. They were often seen as romantic figures, living a life of adventure and danger.