dispel vs turn back

dispel

verb
  • To remove (fears, doubts, objections etc.) by proving them unjustified. 

  • To drive away or cause to vanish by scattering. 

noun
  • An act or instance of dispelling. 

turn back

verb
  • To prevent or refuse to allow passage or progress. 

  • To cause to reverse direction and retrace one's steps. 

  • To return to a previous state of being. 

  • To reverse direction and retrace one's steps. 

  • To adjust to a previous setting. 

  • To fold something back; to fold down. 

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