computer science vs utility

computer science and utility both are nouns.

Word	Noun	Adjective	Verb	Adverb
computer science	Yes	No	No	No
utility	Yes	Yes	No	No

computer science (noun)	utility (noun)
the branch of engineering science that studies (with the aid of computers) computable processes and structures	the service (electric power or water or transportation) provided by a public utility
	a facility composed of one or more pieces of equipment connected to or part of a structure and designed to provide a service such as heat or electricity or water or sewage disposal
	the quality of being of practical use
	(computer science) a program designed for general support of the processes of a computer
	a company that performs a public service; subject to government regulation
	(economics) a measure that is to be maximized in any situation involving choice

computer science (adjective)	utility (adjective)
	used of beef; usable but inferior
	capable of substituting in any of several positions on a team