boneyard vs ossuary

boneyard

noun
  • A graveyard. 

  • A dumpsite for obsolete or unusable aircraft. 

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

ossuary

noun
  • A container, receptacle, or building, such as an urn or vault, for holding the bones of the dead. 

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