theorization vs American spelling

theorization and American spelling both are nouns.

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

theorization (noun)	American spelling (noun)
the production or use of theories	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')