buccaneer vs raider

buccaneer and raider both are nouns.

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

As nouns, raider is a hypernym of buccaneer; that is, raider 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
raider: someone who takes spoils or plunder (as in war)

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

buccaneer (noun)	raider (noun)
someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation	a corporate investor who intends to take over a company by buying a controlling interest in its stock and installing new management
	someone who takes spoils or plunder (as in war)

buccaneer (verb)	raider (verb)
live like a buccaneer