cat burglar vs pickpocket

cat burglar

noun
  • A particularly stealthy burglar, especially one who gains undetected entry through the use of agility. 

pickpocket

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

verb
  • To pick pockets; to steal. 

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