byrnie vs ring armour

byrnie and ring armour both are nouns.

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

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

byrnie: 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 byrnie include chain armor, chain armour, chain mail, mail, ring armor, ring mail.

byrnie (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