hauberk vs chain armor

hauberk and chain armor both are nouns.

Word	Noun	Adjective	Verb	Adverb
hauberk	Yes	No	No	No
chain armor	Yes	No	No	No

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

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

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

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