chain armour vs suit of armor

chain armour and suit of armor both are nouns.

Word	Noun	Adjective	Verb	Adverb
chain armour	Yes	No	No	No
suit of armor	Yes	No	No	No

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

Other hypernyms of chain armour include body armor, body armour, cataphract, coat of mail, suit of armour.

chain armour (noun)	suit of armor (noun)
(Middle Ages) flexible armor made of interlinked metal rings	armor that protects the wearer's whole body