decapitation vs guillotining

decapitation

noun
  • Beheading; the act of beheading or decapitating. 

  • The ousting or destruction of the ruling body of a government or other organization. 

  • The unseating of a senior politician. 

guillotining

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