American spelling vs sulfurous

American spelling is a noun but sulfurous is not a noun.

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

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

American spelling (adjective)	sulfurous (adjective)
	of or related to or containing sulfur or derived from sulfur
	characterized by oppressive heat and humidity
	harsh or corrosive in tone