buccaneer vs looter

buccaneer and looter both are nouns.

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

As nouns, looter is a hypernym of buccaneer; that is, looter is a word with a broader meaning than buccaneer:

buccaneer: someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation
looter: someone who takes spoils or plunder (as in war)

Other hypernyms of buccaneer include despoiler, freebooter, pillager, plunderer, raider, spoiler.

buccaneer (noun)	looter (noun)
someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation	someone who takes spoils or plunder (as in war)

buccaneer (verb)	looter (verb)
live like a buccaneer