altar vs monstrance

altar

noun
  • A table or similar flat-topped structure used for religious rites. 

  • A raised area around an altar in a church; the sanctuary. 

  • Any (real or notional) place where something is worshipped or sacrificed to. 

monstrance

noun
  • An ornamental, often precious receptacle, either open or with a transparent cover, in which the sacramental bread (consecrated host) is placed for Eucharistic adoration. 

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