American spelling vs itemization

American spelling and itemization both are nouns.

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

American spelling (noun)	itemization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	the act of making a list of items