American spelling vs annex

American spelling and annex both are nouns.

Word	Noun	Adjective	Verb	Adverb
American spelling	Yes	No	No	No
annex	Yes	No	Yes	No

American spelling (noun)	annex (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	an addition that extends a main building

American spelling (verb)	annex (verb)
	add an extra part to
	take (territory) as if by conquest