dastard vs diablo

dastard

noun
  • A malicious coward; a dishonorable sneak. 

verb
  • To dastardize. 

adj
  • Meanly shrinking from danger, cowardly, dastardly. 

diablo

noun
  • the devil 

adj
  • diable, flavoured with hot spices 

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