pillager vs looter

pillager and looter both are nouns.

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

As nouns, pillager and looter are synonyms defined as:

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

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