nuncio vs vicar

nuncio

noun
  • The ecclesiastic title of a permanent diplomatic representative of the Roman Catholic Church to a sovereign state or international organization, who is accorded a rank equivalent to an accredited ambassador, and may also be given additional privileges including recognition as Dean in a country's diplomatic corps. 

  • Any member of any Sejm of the Kingdom of Poland, Polish–Lithuanian Commonwealth, Galicia (of the Austrian Partition), Duchy of Warsaw, Congress Poland, or Grand Duchy of Posen. 

  • One who bears a message; a messenger. 

vicar

noun
  • In the Roman Catholic and some other churches, a cleric acting as local representative of a higher ranking member of the clergy. 

  • A person acting on behalf of, or representing, another person. 

  • In the Church of England, the priest of a parish, receiving a salary or stipend but not tithes. 

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