pickpocket vs rip off

pickpocket

verb
  • To pick pockets; to steal. 

noun
  • One who steals from the pocket of a passerby, usually by sleight of hand. 

rip off

verb
  • To pull off by ripping 

  • To steal, cheat or swindle. Especially to charge an exorbitant or unfair rate. 

  • To copy, especially illegally. 

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