compartmentalize vs American spelling

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

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

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

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