premiership vs superintendency

premiership

noun
  • The office of a premier or prime minister. 

  • The position held by the champion team at the end of a particular season (especially as used in Australian rules football). 

superintendency

noun
  • The condition of being a superintendent 

  • The act of superintending 

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