diabolism vs rune

diabolism

noun
  • The property of having attributes that are demonic or Satanic. 

  • Character, action, utterances, creative works, behavior or principles appropriate to the devil. 

  • Worship of the devil; Satanism 

  • Possession by Satan or other demonic forces. 

rune

noun
  • A letter or mark used as a mystical or magic symbol. 

  • A letter, or character, used in the written language of various ancient Germanic peoples, especially the Scandinavians and the Anglo-Saxons. 

  • A Finnish or Scandinavian epic poem, or a division of one, especially a division of the Kalevala. 

  • A verse or song, especially one with mystical or mysterious overtones; a spell or an incantation. 

  • A Unicode code point. 

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