thriftiness vs economy

thriftiness and economy both are nouns.

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

As nouns, thriftiness and economy are synonyms defined as:

thriftiness and economy: frugality in the expenditure of money or resources

thriftiness (noun)	economy (noun)
frugality in the expenditure of money or resources	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