diablo vs fiend

diablo

noun
  • the devil 

adj
  • diable, flavoured with hot spices 

fiend

noun
  • A devil or demon; a malignant or diabolical being; an evil spirit. 

  • An addict or fanatic. 

  • A very evil person. 

verb
  • To yearn; to be desperate (for something). 

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