hobby vs sadness

hobby

noun
  • An activity that one enjoys doing in one's spare time. 

  • Any of four species of small falcons in the genus Falco, especially Falco subbuteo. 

  • An extinct breed of horse native to the British Isles, also known as the Irish Hobby 

sadness

noun
  • The state or emotion of being sad. 

  • An event in one's life that causes sadness. 

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