dissatisfaction vs reward

dissatisfaction

noun
  • the cause of such feelings 

  • unhappiness or discontent 

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 dissatisfaction and reward occurred in a corpus of books? (source: Google Ngram Viewer )