casket vs cist

casket

noun
  • A coffin. 

  • A gasket. 

  • An urn. 

  • A little box, e.g. for jewellery. 

verb
  • To put into, or preserve in, a casket. 

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. 

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