American spelling vs overcapitalize

American spelling is a noun but overcapitalize is not a noun.

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

American spelling (noun)	overcapitalize (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')

American spelling (verb)	overcapitalize (verb)
	capitalize beyond what the business or the profit-making prospects warrant
	overestimate the market value of
	estimate the capital value of (a company) at an unreasonably or unlawfully high level