American spelling vs overutilization

American spelling and overutilization both are nouns.

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

American spelling (noun)	overutilization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	exploitation to the point of diminishing returns