armor vs American spelling

armor and American spelling both are nouns.

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

armor (noun)	American spelling (noun)
tough more-or-less rigid protective covering of an animal or plant	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')
protective covering made of metal and used in combat
a military unit consisting of armored fighting vehicles

armor (verb)	American spelling (verb)
equip with armor