ring mail vs ring armor

ring mail and ring armor both are nouns.

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

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

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

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

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