libertine vs rounder

libertine

noun
  • Someone (especially a man) who takes no notice of moral laws, especially those involving sexual propriety; someone loose in morals; a pleasure-seeker. 

  • One who is freethinking in religious matters. 

  • Someone freed from slavery in Ancient Rome; a freedman. 

adj
  • Dissolute, licentious, profligate; loose in morals. 

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 libertine and rounder occurred in a corpus of books? (source: Google Ngram Viewer )