death knell vs reverberation

death knell

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

  • The tolling of a bell announcing death. 

reverberation

noun
  • A violent oscillation or vibration. 

  • The reflection of light or heat; a reflection in, or as though in, a mirror. 

  • An echo, or a series of overlapping echoes. 

  • An evolving series of effects resulting from a particular event; a repercussion. 

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