American spelling vs compartmentalize

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

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

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

American spelling (verb)	compartmentalize (verb)
	separate into isolated compartments or categories