unappetizing vs American spelling

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

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

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

unappetizing (adjective)	American spelling (adjective)
not appetizing in appearance, aroma, or taste