drive off vs expel

drive off

verb
  • To force to leave or go away. 

  • Used other than figuratively or idiomatically: see drive, off. 

expel

verb
  • To eject or erupt. 

  • To remove from membership. 

  • To deport. 

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