oratory vs sacristy

oratory

noun
  • A private chapel or prayer room. 

  • Eloquence; the quality of artistry and persuasiveness in speech or writing. 

  • A Roman Catholic chapel; a building for public or private worship that is not a parish church. 

  • A Catholic church belonging to the Oratory of Saint Philip Neri. 

  • The art of public speaking, especially in a formal, expressive, or forceful manner. 

sacristy

noun
  • A room in a church where sacred vessels, books, vestments, etc. are kept. Sometimes also used by clergy to prepare for worship or for meetings. 

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