computer science vs e-mail

computer science and e-mail both are nouns.

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

computer science (noun)	e-mail (noun)
the branch of engineering science that studies (with the aid of computers) computable processes and structures	(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

computer science (verb)	e-mail (verb)
	communicate electronically on the computer