metaphysician vs pupil

metaphysician

noun
  • A philosopher who specializes in the scholarly study of metaphysics. 

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 metaphysician and pupil occurred in a corpus of books? (source: Google Ngram Viewer )