American spelling vs utilization

American spelling and utilization both are nouns.

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

American spelling (noun)	utilization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	the act of using
	the state of having been made use of