campana vs death knell

campana

noun
  • A church bell, particularly a large bell used in medieval church steeples or towers. 

  • A bell-shaped vase. 

death knell

noun
  • The tolling of a bell announcing death. 

  • A sign or omen foretelling the death or destruction of something. 

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