caliber vs American spelling

caliber and American spelling both are nouns.

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

caliber (noun)	American spelling (noun)
a degree or grade of excellence or worth	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')
diameter of a tube or gun barrel