auto-suggestion vs hypnosis

auto-suggestion

noun
  • An instance of suggesting a thought to oneself. 

  • The practice of suggesting thoughts to oneself. 

hypnosis

noun
  • A trancelike state, artificially induced, in which a person has a heightened suggestibility, and in which suppressed memories may be experienced. 

  • Any of various sleep-like conditions. 

  • The art or skill of hypnotism. 

How often have the words auto-suggestion and hypnosis occurred in a corpus of books? (source: Google Ngram Viewer )