burian vs cairn

burian

noun
  • A tomb; sepulchre. 

  • A camp; hill-fort. 

  • A barrow; mound; tumulus 

cairn

noun
  • A rounded or conical heap of stones erected by early inhabitants of the British Isles, apparently as a sepulchral monument. 

  • A pile of stones heaped up as a landmark, to guide travelers on land or at sea, or to arrest attention, as in surveying, or in leaving traces of an exploring party, etc. 

  • A cairn terrier. 

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