Synonyms for Despoiler:

n.

despoiler (noun)
looter, freebooter, plunderer, raider, spoiler, pillager.
person (noun)
looter, freebooter, plunderer, raider, spoiler, pillager.
robber (noun)
pillager, looter, raider, plunderer.

Other synonyms:

n.
pillager, raider.