archfiend vs diablo

archfiend

noun

  • Satan. 

  • A chief fiend (devil, demon or monster). 

  • A diabolically evil person. 

diablo

noun

  • the devil 

adj

  • diable, flavoured with hot spices 

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