pirate vs corsair

pirate and corsair both are nouns.

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

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

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

pirate: someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation
corsair: a pirate along the Barbary Coast

Other hyponyms of pirate include Barbary pirate, sea king.

pirate (noun)	corsair (noun)
a ship that is manned by pirates	a swift pirate ship (often operating with official sanction)
someone who robs at sea or plunders the land from the sea without having a commission from any sovereign nation	a pirate along the Barbary Coast
someone who uses another person's words or ideas as if they were his own

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