American spelling vs decimalization

American spelling and decimalization both are nouns.

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

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