ciborium vs sacristy

ciborium

noun
  • A covered receptacle for holding the consecrated wafers of the Eucharist. 

  • A fixed vaulted canopy over a Christian altar, supported on four columns. 

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 ciborium and sacristy occurred in a corpus of books? (source: Google Ngram Viewer )