rip-off vs robbing

rip-off

noun
  • A theft or robbery. 

  • A copy, especially one that is illegal or inferior. 

  • A bad deal; an unfair or exorbitant price or rate. 

  • A scam. 

robbing

noun
  • robbery 

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