subvocalize vs American spelling

subvocalize is not a noun while American spelling is a noun.

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

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

subvocalize (verb)	American spelling (verb)
articulate without making audible sounds