American spelling vs capitalize

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

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

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

American spelling (verb)	capitalize (verb)
	convert (a company's reserve funds) into capital
	consider expenditures as capital assets rather than expenses
	compute the present value of a business or an income
	write in capital letters
	draw advantages from
	supply with capital, as of a business by using a combination of capital used by investors and debt capital provided by lenders