American spelling vs externalize

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

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

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

American spelling (verb)	externalize (verb)
	make external or objective, or give reality to
	regard as objective