caitiff vs quitter

caitiff

noun
  • A base or despicable person; a wretch 

adj
  • Especially despicable; cowardly 

quitter

noun
  • One who quits. 

  • Matter flowing from a wound or sore; pus. 

verb
  • To suppurate; ooze with pus. 

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