assessor vs magister

assessor

noun
  • A specialist who assists the court in determining a matter. 

  • One who assesses a project for cost evaluation. 

  • A civil servant entrusted with checking the veracity of data and criteria used by a taxpayer to complete a tax return. 

  • An official responsible for student welfare. 

  • One who assesses a property for tax or insurance evaluation. 

magister

noun
  • The possessor of a master's degree. 

  • Master; sir: a title used in the Middle Ages, given to a person in authority, or to one having a licence from a university to teach philosophy and the liberal arts. 

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