cad vs rounder

cad

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

rounder

noun
  • A person who makes the rounds of bars, saloons, and similar establishments; figuratively, a debaucher or roué 

  • A railroad man who worked at a roundhouse, operating the turntable. 

  • A fight lasting a specified number of rounds. 

  • A Methodist preacher traveling a circuit, also referred to as a circuit rider. 

  • A tool for making an edge or surface round. 

  • A person who earns a living by playing cards 

  • One who rounds; one who comes about frequently or regularly. 

  • A sports league draft selection in a specified round or the player drafted with that selection. 

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