Monster

Frankenstein, abnormality, barbarian, beast, behemoth, bogeyman, brute, centaur, colossus, demon, devil, dragon, fiend, freak, giant, hellcat, hellhound, hellion, horror, leviathan, little devil, lusus naturae, mammoth, miscreation, monstrosity, mutant, ogre, phoenix, savage, titan, villain, whale

savage
beast, bigot, boor, brute, cannibal, clod, hooligan, hun, ignoramus, lout, monster, philistine, rascal, ruffian, troglodyte, vandal, yahoo

barbarian
animal, beast, cannibal, creature, critter*, degenerate, devil, fiend, lout, monster, ogre, ruffian, sadist, savage, scamp, swine


   evil
Satan, archfiend, beast, brute, devil, evil spirit, fiend, goblin, hellion, imp, incubus, little devil*, malignant spirit, monster, rascal, rogue, vampire, villain, windigo

Nah, McGrath. I can't believe anyone would be offended. lol