computing vs electronic mail

computing and electronic mail both are nouns.

Word	Noun	Adjective	Verb	Adverb
computing	Yes	No	No	No
electronic mail	Yes	No	No	No

computing (noun)	electronic mail (noun)
the procedure of calculating; determining something by mathematical or logical methods	(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
the branch of engineering science that studies (with the aid of computers) computable processes and structures