Synonyms for Spoiler (same or very similar meaning)
WordNet sense 1 (someone who takes spoils or plunder (as in war)):
despoiler, freebooter, looter, pillager, plunderer, raiderWordNet sense 2 (someone who pampers or spoils by excessive indulgence):
coddler, mollycoddler, pampererFrom the ODE community, based on WordNetadd/edit