chantry vs ciborium

chantry

noun
  • A chapel set up for this purpose 

  • An endowment for the maintenance of a priest to sing a daily mass for the souls of specified people 

ciborium

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

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

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