grape arbor vs American spelling

grape arbor and American spelling both are nouns.

Word	Noun	Adjective	Verb	Adverb
grape arbor	Yes	No	No	No
American spelling	Yes	No	No	No

grape arbor (noun)	American spelling (noun)
an arbor where grapes are grown	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')