prefecture vs sanjak

prefecture

noun
  • The jurisdiction of a prefect; the region administered by a prefect, especially as a translation of certain French, Chinese, and Japanese administrative divisions. 

  • The office or position of a prefect. 

sanjak

noun
  • A district, a prefecture, particularly (historical) a second-level administrative division of the Ottoman Empire. 

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