burian vs kurgan

burian

noun
  • A tomb; sepulchre. 

  • A camp; hill-fort. 

  • A barrow; mound; tumulus 

kurgan

noun
  • A prehistoric burial mound once used by peoples in Siberia and Central Asia. 

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