cad vs louse

cad

noun
  • A low-bred, presuming person; a mean, vulgar fellow, especially one that cannot be trusted with a lady. 

louse

verb
  • To remove lice from; to delouse. 

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

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