American spelling vs neighboring

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

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

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

American spelling (adjective)	neighboring (adjective)
	having a common boundary or edge; abutting; touching