freebooter Meaning, Definition & Usage

  1. noun someone who takes spoils or plunder (as in war)
    spoiler; looter; despoiler; plunderer; pillager; raider.

WordNet

Free"boot`er noun
Etymology
D. vrijbuiter, fr. vrijbuiten to plunder; vrij free + buit booty, akin to E. booty. See Free, and Booty, and cf. Filibuster.
Definitions
  1. One who plunders or pillages without the authority of national warfare; a member of a predatory band; a pillager; a buccaneer; a sea robber. Bacon.

Webster 1913