hypnotic vs knockout pill

hypnotic

adj
  • Of, or relating to hypnosis or hypnotism. 

  • Inducing sleep; soporific. 

noun
  • A person who is, or can be, hypnotized. 

  • A soporific substance. 

knockout pill

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