caitiff vs scoundrel

caitiff

noun
  • A base or despicable person; a wretch 

adj
  • Especially despicable; cowardly 

scoundrel

noun
  • A mean, worthless fellow; a rascal; a villain; a person without honour or virtue. 

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