dastard vs louse

dastard

noun
  • A malicious coward; a dishonorable sneak. 

adj
  • Meanly shrinking from danger, cowardly, dastardly. 

verb
  • To dastardize. 

louse

noun
  • A small parasitic wingless insect of the order Psocodea. 

verb
  • To remove lice from; to delouse. 

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