consul vs nuncio

consul

noun
  • Either of the two heads of government and state of the Roman Republic or the equivalent nominal post under the Roman and Byzantine Empires. 

  • Any of the three heads of government and state of France between 1799 and 1804. 

  • An official residing in major foreign towns to represent and protect the interests of the merchants and citizens of their country. 

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. 

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