externalize vs American spelling

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

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

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

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