folding money vs paper currency

folding money and paper currency both are nouns.

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

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

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

Other synonyms of folding money include paper money.

folding money (noun)	paper currency (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