freebooter vs pirate

freebooter and pirate both are nouns.

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

As nouns, pirate is a hyponym of freebooter; that is, pirate is a word with a more specific, narrower meaning than freebooter:

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

Other hyponyms of freebooter include buccaneer, sea robber, sea rover.

freebooter (noun)	pirate (noun)
someone who takes spoils or plunder (as in war)	a ship that is manned by pirates
	someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation
	someone who uses another person's words or ideas as if they were his own

freebooter (verb)	pirate (verb)
	take arbitrarily or by force
	copy illegally; of published material