debt vs reward

debt

noun
  • An action, state of mind, or object one has an obligation to perform for another, adopt toward another, or give to another. 

  • Money that one person or entity owes or is required to pay to another, generally as a result of a loan or other financial transaction. 

  • The state or condition of owing something to another. 

  • An action at law to recover a certain specified sum of money alleged to be due 

reward

noun
  • Something of value given in return for an act. 

  • A prize promised for a certain deed or catch 

  • The result of an action, whether good or bad. 

verb
  • To give a reward to or for. 

  • To recompense. 

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