caitiff vs coward

caitiff

adj
  • Especially despicable; cowardly 

noun
  • A base or despicable person; a wretch 

coward

adj
  • Cowardly. 

  • Borne in the escutcheon with his tail doubled between his legs. 

noun
  • A person who lacks courage. 

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