kill by hanging vs slaughter

kill by hanging

verb
  • to kill someone by suspending them by the neck 

slaughter

verb
  • To kill someone or something, especially in a particularly brutal manner. 

  • To butcher animals, generally for food. 

  • To massacre people in large numbers. 

noun
  • A rout or decisive defeat. 

  • A mass destruction of non-living things. 

  • The killing of animals, generally for food. 

  • A massacre; the killing of a large number of people. 

  • A group of iguanas. 

How often have the words kill by hanging and slaughter occurred in a corpus of books? (source: Google Ngram Viewer )