paper currency vs paper money

paper currency and paper money both are nouns.

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

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

paper currency and paper 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 folding money.

paper currency (noun)	paper 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