corselet vs coat of mail

corselet and coat of mail both are nouns.

Word	Noun	Adjective	Verb	Adverb
corselet	Yes	No	No	No
coat of mail	Yes	No	No	No

As nouns, coat of mail is a hypernym of corselet; that is, coat of mail is a word with a broader meaning than corselet:

corselet: a piece of body armor for the trunk; usually consists of a breastplate and back piece
coat of mail: armor that protects the wearer's whole body

Other hypernyms of corselet include body armor, body armour, cataphract, suit of armor, suit of armour.

corselet (noun)	coat of mail (noun)
a piece of body armor for the trunk; usually consists of a breastplate and back piece	armor that protects the wearer's whole body