nouns
the bags of letters and packages that are transported by the postal service
is a type of (narrower)
a communication (usually brief) that is written or spoken or signaled
"he sent a three-word message"
the system whereby messages are transmitted via the post office
"the mail handles billions of items every day"; "he works for the United States mail service"; "in England they call mail `the post'"
a conveyance that transports the letters and packages that are conveyed by the postal system
is a type of (narrower)
something that serves as a means of transportation
any particular collection of letters or packages that is delivered
"your mail is on the table"; "is there any post for me?"; "she was opening her post"
(Middle Ages) flexible armor made of interlinked metal rings