chancellery vs incumbency

chancellery

noun
  • The rank or post of a chancellor 

  • The office or staff of a chancellor 

  • The building in which such an office is situated 

incumbency

noun
  • A tenure. 

  • Benefice, lucrative position or possession. 

  • The state of being incumbent. 

  • An obligation or duty. 

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