brigandine vs chain mail

brigandine and chain mail both are nouns.

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

As nouns, chain mail is a hypernym of brigandine; that is, chain 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
chain mail: (Middle Ages) flexible armor made of interlinked metal rings

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

brigandine (noun)	chain 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