lady of leisure vs mud-kicker

lady of leisure

noun
  • A female prostitute. 

  • An unemployed woman or one who has retired from work. 

  • A lady who is of independent means and so does not need employment; one who is free from duties and responsibilities. 

mud-kicker

noun
  • Streetwalker; a prostitute who looks for customers in public places, especially one who works for a pimp. 

  • An unskilled laborer; One who makes his living by outdoor manual labor. 

  • A workboot designed for outdoor work, especially one that can be worn on muddy ground. 

  • A racehorse. 

How often have the words lady of leisure and mud-kicker occurred in a corpus of books? (source: Google Ngram Viewer )