dispel vs unburdening

dispel

noun
  • An act or instance of dispelling. 

verb
  • To drive away or cause to vanish by scattering. 

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

unburdening

noun
  • The act by which one unburdens oneself. 

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