knell vs uvula

knell

noun
  • The sound of a bell knelling; a toll (particularly one signalling a death). 

  • A sign of the end or demise of something or someone. 

verb
  • To ring a bell slowly, especially for a funeral; to toll. 

  • To signal or proclaim something (especially a death) by ringing a bell. 

  • To summon by, or as if by, ringing a bell. 

uvula

noun
  • an object so suspended inside a bell that it may hit the bell and cause it to ring; a clapper 

  • the slight elevation in the mucous membrane immediately behind the internal urethral orifice of the urinary bladder, caused by the middle lobe of the prostate 

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