carjacking vs hijack

carjacking and hijack both are nouns.

Word	Noun	Adjective	Verb	Adverb
carjacking	Yes	No	No	No
hijack	Yes	No	Yes	No

As nouns, hijack is a hypernym of carjacking; that is, hijack is a word with a broader meaning than carjacking:

carjacking: the violent theft of an occupied car
hijack: seizure of a vehicle in transit either to rob it or divert it to an alternate destination

Other hypernyms of carjacking include highjack.

carjacking (noun)	hijack (noun)
the violent theft of an occupied car	seizure of a vehicle in transit either to rob it or divert it to an alternate destination

carjacking (verb)	hijack (verb)
	take arbitrarily or by force
	seize control of