arrogate vs hijack

arrogate is not a noun while hijack is a noun.

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

As verbs, hijack is a hyponym of arrogate; that is, hijack is a word with a more specific, narrower meaning than arrogate:

arrogate: seize and take control without authority and possibly with force; take as one's right or possession
hijack: seize control of

Other hyponyms of arrogate include annex, appropriate, capture, conquer, seize, preoccupy, raid.

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

arrogate (verb)	hijack (verb)
seize and take control without authority and possibly with force; take as one's right or possession	take arbitrarily or by force
make undue claims to having	seize control of
demand as being one's due or property; assert one's right or title to