autosuggestion vs overtone

autosuggestion

noun
  • An instance of suggesting a thought to oneself. 

  • An autosuggest feature. 

  • The practice of suggesting thoughts to oneself, as in autohypnosis. 

overtone

noun
  • An implicit message (in a film, book, verbal discussion or similar) perceived as overwhelming the explicit message. 

  • A tone whose frequency is an integer multiple of another; a member of the harmonic series. 

verb
  • To give an overtone to. 

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