gentlemen's vs shitter

gentlemen's

noun
  • Synonym of men's room: a lavatory intended for use by men. 

  • possessive case of gentlemen: belonging to some or all gentlemen. 

shitter

noun
  • A toilet or lavatory; an outhouse. 

  • One who defecates. 

  • The anus. 

  • Someone lacking skill, especially in a video game. 

  • An objectionable person or thing. 

How often have the words gentlemen's and shitter occurred in a corpus of books? (source: Google Ngram Viewer )