pickpocket vs robber

pickpocket

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

verb
  • To pick pockets; to steal. 

robber

noun
  • A person who robs. 

  • An animal who robs. 

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