chain mail vs ring armor

chain mail and ring armor both are nouns.

Word	Noun	Adjective	Verb	Adverb
chain mail	Yes	No	No	No
ring armor	Yes	No	No	No

As nouns, chain mail and ring armor are synonyms defined as:

chain mail and ring armor: (Middle Ages) flexible armor made of interlinked metal rings

Other synonyms of chain mail include chain armor, chain armour, mail, ring armour, ring mail.

chain mail (noun)	ring armor (noun)
(Middle Ages) flexible armor made of interlinked metal rings	(Middle Ages) flexible armor made of interlinked metal rings