cist vs mausoleum

cist

noun
  • A crypt cut into rock, chalk, or a tree trunk, especially a coffin formed by placing stone slabs on edge and topping them with a horizontal slab or slabs. 

  • A small receptacle for sacred utensils carried in festivals in Ancient Greece. 

mausoleum

noun
  • A large stately tomb or a building housing such a tomb or several tombs. 

  • A gloomy, usually large room or building. 

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