bullpen vs mansion

bullpen

noun
  • A place for someone or something to get ready. 

  • The relief pitchers of a team collectively. 

  • An enclosed area for pitchers to warm up in during a game. 

  • An enclosed area used to hold bulls. 

  • An open seating arrangement where project teams can communicate openly with minimal effort. 

mansion

noun
  • A luxurious flat (apartment). 

  • An astrological house; a station of the moon. 

  • An apartment building. 

  • One of twenty-eight sections of the sky. 

  • An individual habitation or apartment within a large house or group of buildings. (Now chiefly in allusion to John 14:2.) 

  • Any of the branches of the Rastafari movement. 

  • A large house or building, usually built for the wealthy. 

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