frightful vs ghoulish

frightful

adj
  • Genuinely horrific, awful, or alarming. 

  • Unpleasant, dreadful, awful (also used as an intensifier). 

adv
  • Frightfully; very. 

ghoulish

adj
  • Of or pertaining to corpses and graverobbing. 

  • Of or pertaining to ghouls. 

  • Fascinated by corpses. 

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