paper currency vs folding money

paper currency and folding money both are nouns.

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

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

paper currency 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 currency include paper money.

paper currency (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