plunderer vs pillager

plunderer and pillager both are nouns.

Word	Noun	Adjective	Verb	Adverb
plunderer	Yes	No	No	No
pillager	Yes	No	No	No

As nouns, plunderer and pillager are synonyms defined as:

Other synonyms of plunderer include despoiler, freebooter, looter, raider, spoiler.

plunderer (noun)	pillager (noun)
someone who takes spoils or plunder (as in war)	someone who takes spoils or plunder (as in war)