overutilization vs American spelling

overutilization and American spelling both are nouns.

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

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