ring mail vs chain mail

ring mail and chain mail both are nouns.

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

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

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

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

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