headship vs prefecture

headship

noun
  • The position of a headmaster or headmistress. 

  • The position of a head or chief. 

prefecture

noun
  • The office or position of a prefect. 

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

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