ring armor vs chain armour

ring armor and chain armour both are nouns.

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

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

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

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

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