commandery vs prefecture

commandery

noun
  • Any of various administrative divisions of imperial China. 

  • The smallest division of a manor under the control of a commander of an order of knights, originally only the Knights Hospitaller. 

  • A chapter of a secret order, especially the Knights Templar (order affiliated with Freemasonry). 

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. 

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