seize vs hijack

seize is not a noun while hijack is a noun.

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

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

Other hyponyms of seize include raven, wrest, abduct, kidnap, nobble, snatch, commandeer, highjack, pirate.

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

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

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

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

seize (verb)	hijack (verb)
capture the attention or imagination of	take arbitrarily or by force
affect	seize control of
take into your hands deliberately
take or capture by force
hook by a pull on the line
take possession of by force, as after an invasion
take temporary possession of as a security, by legal authority
seize and take control without authority and possibly with force; take as one's right or possession