mail vs suit of armor

mail and suit of armor both are nouns.

Word	Noun	Adjective	Verb	Adverb
mail	Yes	No	Yes	No
suit of armor	Yes	No	No	No

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

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

mail (noun)	suit of armor (noun)
(Middle Ages) flexible armor made of interlinked metal rings	armor that protects the wearer's whole body
a conveyance that transports the letters and packages that are conveyed by the postal system
the system whereby messages are transmitted via the post office
the bags of letters and packages that are transported by the postal service
any particular collection of letters or packages that is delivered

mail (verb)	suit of armor (verb)
cause to be directed or transmitted to another place
send via the postal service