bad news vs tragedy

bad news

noun
  • News of unpleasant, unfortunate or sad events. 

  • An irritating, troublesome or harmful person, situation or thing. 

tragedy

noun
  • A disastrous event, especially one involving great loss of life or injury. 

  • A drama or similar work, in which the main character is brought to ruin or otherwise suffers the extreme consequences of some tragic flaw or weakness of character. 

  • The genre of such works, and the art of producing them. 

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