pirate vs highjack

pirate and highjack both are nouns.

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

As verbs, pirate and highjack are synonyms defined as:

Other synonyms of pirate include commandeer, hijack.

pirate (noun)	highjack (noun)
a ship that is manned by pirates	seizure of a vehicle in transit either to rob it or divert it to an alternate destination
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 (verb)	highjack (verb)
take arbitrarily or by force	take arbitrarily or by force
copy illegally; of published material