economy vs curtailment

economy and curtailment both are nouns.

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

As nouns, curtailment is a hyponym of economy; that is, curtailment is a word with a more specific, narrower meaning than economy:

economy: an act of economizing; reduction in cost
curtailment: the reduction of expenditures in order to become financially stable

Other hyponyms of economy include downsizing, retrenchment, economy of scale.

economy (noun)	curtailment (noun)
an act of economizing; reduction in cost	the act of withholding or withdrawing some book or writing from publication or circulation
frugality in the expenditure of money or resources	the reduction of expenditures in order to become financially stable
the efficient use of resources	the temporal property of being cut short
the system of production and distribution and consumption