grief vs sadness

grief

noun
  • Emotional pain, generally arising from misfortune, significant personal loss, bereavement, misconduct of oneself or others, etc.; sorrow; sadness. 

  • Suffering, hardship. 

  • Cause or instance of sorrow or pain; that which afflicts or distresses; trial. 

verb
  • To deliberately harass and annoy or cause grief to other players of a game in order to interfere with their enjoyment of it; especially, to do this as one’s primary activity in the game. 

sadness

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

  • The state or emotion of being sad. 

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