economy vs thriftiness

economy and thriftiness both are nouns.

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

As nouns, economy and thriftiness are synonyms defined as:

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

economy (noun)	thriftiness (noun)
an act of economizing; reduction in cost	frugality in the expenditure of money or resources
frugality in the expenditure of money or resources
the efficient use of resources
the system of production and distribution and consumption