power of attorney vs procurator

power of attorney

noun
  • The legal authorisation of one person to act as the agent of another. 

  • A legal document allowing one person to act as the agent of another. 

procurator

noun
  • An agent or attorney. 

  • A tax collector. 

  • The governor of a small imperial province. 

  • A legal officer who both investigates and prosecutes crimes, found in some inquisitorial legal systems, particularly communist or formerly communist states – see public procurator 

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