gusset vs chain armour

gusset and chain armour both are nouns.

Word	Noun	Adjective	Verb	Adverb
gusset	Yes	No	No	No
chain armour	Yes	No	No	No

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

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

gusset (noun)	chain armour (noun)
a piece of material used to strengthen or enlarge a garment	(Middle Ages) flexible armor made of interlinked metal rings
a metal plate used to strengthen a joist
a piece of chain mail covering a place unprotected by armor plate