Source : Webster's Revised Unabridged Dictionary (1913)

Plunderer \Plun"der*er\, n.
   One who plunders or pillages.

Source : WordNet®

plunderer
     n : someone who takes spoils or plunder (as in war) [syn: {pillager},
          {looter}, {spoiler}, {despoiler}, {raider}, {freebooter}]