income vs reward

income

noun
  • A disease or ailment without known or apparent cause, as distinguished from one induced by accident or contagion; an oncome. 

  • Money one earns by working or by capitalising on the work of others. 

  • That which is taken into the body as food; the ingesta; sometimes restricted to the nutritive, or digestible, portion of the food. 

  • Money coming in to a fund, account, or policy. 

reward

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

  • Something of value given in return for an act. 

  • A prize promised for a certain deed or catch 

verb
  • To give a reward to or for. 

  • To recompense. 

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