banknote vs mintage

banknote

noun
  • A piece of paper currency. 

  • A promissory note issued by a bank, payable at a given time to a specific beneficiary. 

mintage

noun
  • The batch of coins minted at one time 

  • The fee paid to a mint 

  • The process of minting coins 

  • Coins collectively; specie 

How often have the words banknote and mintage occurred in a corpus of books? (source: Google Ngram Viewer )