gratification vs unhappiness

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. 

unhappiness

noun
  • The feeling of not being happy 

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