The Collaborative International Dictionary of English v.0.48:

Ravager \Rav"a*ger\ (-[asl]*j[~e]r), n.
   One who, or that which, ravages or lays waste; spoiler.
   [1913 Webster]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "ravager":
   betrayer, debaucher, deceiver, defiler, depredator, despoiler,
   forager, forayer, freebooter, looter, marauder, pillager,
   plunderer, raider, raper, rapist, rapparee, ravisher, reiver,
   rifler, sacker, seducer, spoiler, spoliator, violator, wrecker