arbor vs American spelling

arbor and American spelling both are nouns.

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

arbor (noun)	American spelling (noun)
a framework that supports climbing plants	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')
any of various rotating shafts that serve as axes for larger rotating parts
tree (as opposed to shrub)