ring armor vs American spelling

ring armor and American spelling both are nouns.

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

ring armor (noun)	American spelling (noun)
(Middle Ages) flexible armor made of interlinked metal rings	English orthography used in the United States (characterized by 'analyze', 'center', 'usable')