mail vs e-mail

mail and e-mail both are nouns.

Word	Noun	Adjective	Verb	Adverb
mail	Yes	No	Yes	No
e-mail	Yes	No	Yes	No

mail (noun)	e-mail (noun)
(Middle Ages) flexible armor made of interlinked metal rings	(computer science) a system of world-wide electronic communication in which a computer user can compose a message at one terminal that can be regenerated at the recipient's terminal when the recipient logs in
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)	e-mail (verb)
cause to be directed or transmitted to another place	communicate electronically on the computer
send via the postal service