fiat money vs folding money

fiat money and folding money both are nouns.

Word	Noun	Adjective	Verb	Adverb
fiat money	Yes	No	No	No
folding money	Yes	No	No	No

As nouns, folding money is a hypernym of fiat money; that is, folding money is a word with a broader meaning than fiat money:

fiat money: money that the government declares to be legal tender although it cannot be converted into standard specie
folding money: currency issued by a government or central bank and consisting of printed paper that can circulate as a substitute for specie

Other hypernyms of fiat money include paper currency, paper money.

fiat money (noun)	folding money (noun)
money that the government declares to be legal tender although it cannot be converted into standard specie	currency issued by a government or central bank and consisting of printed paper that can circulate as a substitute for specie