American spelling vs compartmentalization

American spelling and compartmentalization both are nouns.

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

American spelling (noun)	compartmentalization (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	the act of distributing things into classes or categories of the same type
	a mild state of dissociation