looter vs freebooter

looter and freebooter both are nouns.

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

As nouns, looter and freebooter are synonyms defined as:

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

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