commercial bank vs exchequer

commercial bank

noun
  • A bank whose chief business is accepting demand deposits and making short-term loans. 

exchequer

noun
  • An available fund of money, especially one for a specific purpose. 

  • A treasury. 

verb
  • To proceed against (a person) in the Court of Exchequer. 

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