ghoulish vs perverted

ghoulish

adj
  • Of or pertaining to ghouls. 

  • Of or pertaining to corpses and graverobbing. 

  • Fascinated by corpses. 

perverted

adj
  • Of, relating to, or practicing unusual or "kinky" sex. 

  • Deviating from what is normally considered right, normal or correct. 

  • Misrepresented, altered or distorted. 

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