highjack vs pirate

highjack and pirate both are nouns.

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

As verbs, highjack and pirate are synonyms defined as:

Other synonyms of highjack include commandeer, hijack.

highjack (noun)	pirate (noun)
seizure of a vehicle in transit either to rob it or divert it to an alternate destination	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

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