banknote vs due date

banknote

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

  • A piece of paper currency. 

due date

noun
  • The date of payment in financial arrangements. 

  • The date on which a pregnant woman is expected to give birth. 

  • The date by which a book (or other item) borrowed from a library must be returned. 

  • The date by which a task is supposed to be completed. 

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