cack vs call of nature

cack

noun
  • An act of defecation. 

  • A discordant note. 

  • A squawk. 

  • Excrement. 

  • Rubbish. 

  • 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. 

call of nature

noun
  • The bodily urge to urinate or defecate. 

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