ghoul vs guardian angel

ghoul

noun
  • A demon said to feed on corpses. 

  • A person with a callous or uncaring attitude to human life and suffering, particularly when prioritising economic concerns. 

  • A person with an undue interest in death and corpses, or more generally in things that are revolting and repulsive. 

  • A graverobber. 

guardian angel

noun
  • A tutelary angel watching over a particular person in monotheistic contexts. 

  • A person who watches over another. 

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