American spelling vs theorize

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

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

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

American spelling (verb)	theorize (verb)
	to believe especially on uncertain or tentative grounds
	form or construct theories
	construct a theory about