nonmalignant tumor vs American spelling

nonmalignant tumor and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
nonmalignant tumor	Yes	No	No	No
American spelling	Yes	No	No	No

nonmalignant tumor (noun)	American spelling (noun)
a tumor that is not cancerous	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')