genius vs past master

genius

noun
  • Someone possessing extraordinary intelligence or skill; especially somebody who has demonstrated this by a creative or original work in science, music, art etc. 

  • Inspiration, a mental leap, an extraordinary creative process. 

  • Extraordinary mental capacity. 

  • The tutelary deity or spirit of a place or person. 

adj
  • Ingenious, brilliant, very clever, or original. 

past master

noun
  • One who has an extremely high level of ability or knowledge within an area of achievement or expertise. 

  • Someone who has previously been a master at a given lodge. 

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