asset vs promissory note

asset

noun
  • Coordinate term: liability 

  • A woman's breasts or buttocks or a man's genitalia. 

  • Any component, model, process or framework of value that can be leveraged or reused. 

  • An intelligence asset. 

  • A thing or quality that has value, especially one that generates cash flows. 

  • Any item recorded on the left-hand side of a balance sheet. 

promissory note

noun
  • A document saying that someone owes a specific amount of money to someone else, often with the deadline and interest fees; the primary purposes of a promissory note are to evidence the debt obligation incurred, and to establish terms for payment thereof. 

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