cack vs self-immolation

cack

noun
  • Excrement. 

  • A discordant note. 

  • A squawk. 

  • Rubbish. 

  • An act of defecation. 

  • Penis. 

verb
  • To squawk. 

  • To laugh. 

  • To incorrectly play a note by hitting a partial other than the one intended. 

  • To defecate. 

  • To defecate (on); to shit. 

  • To kill. 

self-immolation

noun
  • The act of self-sacrificing oneself, in any manner of ways. 

  • The act of setting oneself on fire, especially as a form of protest. 

How often have the words cack and self-immolation occurred in a corpus of books? (source: Google Ngram Viewer )