utility vs economic science

utility and economic science both are nouns.

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

utility (noun)	economic science (noun)
the service (electric power or water or transportation) provided by a public utility	the branch of social science that deals with the production and distribution and consumption of goods and services and their management
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

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