chapter house vs monastery

chapter house

noun
  • A building used by a sorority or fraternity as a residence or meeting place. 

  • A building attached to a cathedral, church, or monastery and used as a meeting place. 

monastery

noun
  • A building for housing monks or others who have taken religious vows. 

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