freebooter vs plunderer

freebooter and plunderer both are nouns.

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

As nouns, freebooter and plunderer are synonyms defined as:

freebooter and plunderer: someone who takes spoils or plunder (as in war)

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

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