pillager vs plunderer

pillager and plunderer both are nouns.

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

As nouns, pillager and plunderer are synonyms defined as:

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

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