decimalization vs American spelling

decimalization and American spelling both are nouns.

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

decimalization (noun)	American spelling (noun)
the act of changing to a decimal system	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')