rough sleeper vs skell

rough sleeper

noun
  • A homeless person who sleeps outdoors. 

skell

noun
  • a homeless person, especially one who sleeps in the New York subway. 

  • A male suspicious person or crime suspect, especially a street person such as a drug dealer, pimp or panhandler. 

verb
  • To fall off or fall over. 

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