mixed economy vs economy

mixed economy and economy both are nouns.

Word	Noun	Adjective	Verb	Adverb
mixed economy	Yes	No	No	No
economy	Yes	No	No	No

As nouns, economy is a hypernym of mixed economy; that is, economy is a word with a broader meaning than mixed economy:

mixed economy: an economic system that combines private and state enterprises
economy: the system of production and distribution and consumption

Other hypernyms of mixed economy include economic system.

mixed economy (noun)	economy (noun)
an economic system that combines private and state enterprises	an act of economizing; reduction in cost
	frugality in the expenditure of money or resources
	the efficient use of resources
	the system of production and distribution and consumption