chatelain vs mayor

chatelain

noun
  • Synonym of castellan: the lord of a castle; a caretaker entrusted to oversee a castle for its lord. 

mayor

noun
  • Synonym of mair, various former officials in the Kingdom of Scotland. 

  • A local VIP, a muckamuck or big shot reckoned to lead some local group. 

  • The chief executive of the municipal government of a city, borough, etc., formerly (historical) usually appointed as a caretaker by European royal courts but now usually appointed or elected locally. 

  • A largely ceremonial position in some municipal governments that presides over the city council while a contracted city manager holds actual executive power. 

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