arrogate vs annex

arrogate is not a noun while annex is a noun.

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

As verbs, annex is a hyponym of arrogate; that is, annex 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
annex: take (territory) as if by conquest

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

arrogate (noun)	annex (noun)
	an addition that extends a main building

arrogate (verb)	annex (verb)
seize and take control without authority and possibly with force; take as one's right or possession	add an extra part to
make undue claims to having	take (territory) as if by conquest
demand as being one's due or property; assert one's right or title to