chain armor vs ring armor

chain armor and ring armor both are nouns.

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

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

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

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

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