cenacle vs fraternity

cenacle

noun
  • A small circle or gathering of specialists (writers etc). 

  • A dining room, especially one on an upper floor (traditionally the room in which the Last Supper took place). 

fraternity

noun
  • A group of people associated for a common purpose. 

  • A social organization of male students at a college or university; usually identified by Greek letters. 

  • The quality of being brothers or brotherly; brotherhood. 

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