Boot Hill vs crypt

Boot Hill

name
  • Name used for many cemeteries in the American Old West; nickname for any cemetery. 

crypt

noun
  • Any of the genus Cryptopus of orchids of Madagascar and Mauritius. 

  • A small pit or cavity in the surface of an organ or other structure. 

  • Any of the genus Cryptocoryne of aquatic plants of southern and southeastern Asia. 

  • An underground vault, especially one beneath a church that is used as a burial place. 

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