Golgotha vs boneyard

Golgotha

noun
  • A charnel house. 

name
  • The hill outside Jerusalem where Jesus was crucified. 

boneyard

noun
  • A dumpsite for obsolete or unusable aircraft. 

  • In the game of dominoes, the pile of upside-down pieces that have yet to be used. 

  • A graveyard. 

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