pirate ship vs pirate

pirate ship and pirate both are nouns.

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

As nouns, pirate ship and pirate are synonyms defined as:

pirate ship (noun)	pirate (noun)
a ship that is manned by pirates	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

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