dissatisfaction vs gratification

dissatisfaction

noun
  • the cause of such feelings 

  • unhappiness or discontent 

gratification

noun
  • The act of gratifying or pleasing, either the mind, or the appetite or taste. 

  • A gratuity; a reward. 

  • A feeling of pleasure; satisfaction. 

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