American spelling vs publicly

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

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

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

American spelling (adverb)	publicly (adverb)
	in a manner accessible to or observable by the public; openly
	by the public or the people generally