American spelling vs unionize

American spelling is a noun but unionize is not a noun.

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

American spelling (noun)	unionize (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

American spelling (verb)	unionize (verb)
	form or join a union
	recruit for a union or organize into a union