ring mail vs chain armor

ring mail and chain armor both are nouns.

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

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

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

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

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