chorten vs ciborium

chorten

noun
  • A Tibetan stupa. 

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. 

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