hauberk vs ring armour

hauberk and ring armour both are nouns.

Word	Noun	Adjective	Verb	Adverb
hauberk	Yes	No	No	No
ring armour	Yes	No	No	No

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

hauberk: a long (usually sleeveless) tunic of chain mail formerly worn as defensive armor
ring armour: (Middle Ages) flexible armor made of interlinked metal rings

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

hauberk (noun)	ring armour (noun)
a long (usually sleeveless) tunic of chain mail formerly worn as defensive armor	(Middle Ages) flexible armor made of interlinked metal rings