paper money vs folding money

paper money and folding money both are nouns.

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

As nouns, paper money and folding money are synonyms defined as:

paper money and folding money: currency issued by a government or central bank and consisting of printed paper that can circulate as a substitute for specie

Other synonyms of paper money include paper currency.

paper money (noun)	folding money (noun)
currency issued by a government or central bank and consisting of printed paper that can circulate as a substitute for specie	currency issued by a government or central bank and consisting of printed paper that can circulate as a substitute for specie