American spelling vs papillary tumor

American spelling and papillary tumor both are nouns.

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

American spelling (noun)	papillary tumor (noun)
English orthography used in the United States (characterized by 'analyze', 'center', 'usable')	a benign epithelial tumor forming a rounded mass