khan vs shah

khan

noun
  • A noble or man of rank in various Muslim countries of Central Asia, including Afghanistan. 

  • A ruler over various Turkish, Tatar and Mongol peoples in the Middle Ages. 

  • A caravanserai; a resting-place for a travelling caravan. 

  • An Ottoman sultan. 

shah

noun
  • A supreme ruler in some Middle Eastern or South Asian nations. 

  • A king of Persia or Iran. 

  • A Ukrainian monetary unit. 

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