don vs pupil

don

noun
  • A university professor, particularly one at Oxford or Cambridge. 

  • An employee of a university residence who lives among the student residents. 

  • A mafia boss. 

  • Any man, bloke, dude. 

verb
  • To put on clothing; to dress (oneself) in an article of personal attire. 

pupil

noun
  • One who studies under supervision of a renowned expert in their field. 

  • A learner at a school under the supervision of a teacher. 

  • The central dark part of an ocellated spot. 

  • The hole in the middle of the iris of the eye, through which light passes to be focused on the retina. 

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