kibitka vs yurt

kibitka

noun
  • A circular tent or yurt used by various nomadic peoples such as the Kalmyks and Kyrgyz. 

  • A Russian type of telega or sleigh with a (usually rounded) cover over the passenger seats. 

yurt

noun
  • A large, round, semi-permanent tent with vertical walls and a conical roof, usually associated with Central Asia and Mongolia (where it is known as a ger). 

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