economics vs utility

economics and utility both are nouns.

Word	Noun	Adjective	Verb	Adverb
economics	Yes	No	No	No
utility	Yes	Yes	No	No

economics (noun)	utility (noun)
the branch of social science that deals with the production and distribution and consumption of goods and services and their management	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

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