basilica vs chapter house

basilica

noun
  • A Christian church building having a nave with a semicircular apse, side aisles, a narthex and a clerestory. 

  • A Roman Catholic church or cathedral with basilican status, an honorific status granted by the pope to recognize its historical, architectural, or sacramental importance. 

chapter house

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

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

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