habergeon vs ring mail

habergeon and ring mail both are nouns.

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

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

habergeon: (Middle Ages) a light sleeveless coat of chain mail worn under the hauberk
ring mail: (Middle Ages) flexible armor made of interlinked metal rings

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

habergeon (noun)	ring mail (noun)
(Middle Ages) a light sleeveless coat of chain mail worn under the hauberk	(Middle Ages) flexible armor made of interlinked metal rings