grief vs heartbreak

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. 

heartbreak

noun
  • overwhelming mental anguish or grief, especially that caused by loss or disappointment 

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