brigandine vs ring mail

brigandine and ring mail both are nouns.

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

As nouns, ring mail is a hypernym of brigandine; that is, ring mail is a word with a broader meaning than brigandine:

brigandine: a medieval coat of chain mail consisting of metal rings sewn onto leather or cloth
ring mail: (Middle Ages) flexible armor made of interlinked metal rings

Other hypernyms of brigandine include chain armor, chain armour, chain mail, mail, ring armor, ring armour.

brigandine (noun)	ring mail (noun)
a medieval coat of chain mail consisting of metal rings sewn onto leather or cloth	(Middle Ages) flexible armor made of interlinked metal rings