bullpen vs prison

bullpen

noun
  • The relief pitchers of a team collectively. 

  • A place for someone or something to get ready. 

  • 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. 

prison

noun
  • Confinement in prison. 

  • A place or institution where people are held against their will, especially for long-term confinement of those awaiting trial or convicted of serious crimes or otherwise considered undesirable by the government. 

  • Any restrictive environment, such as a harsh academy or home. 

verb
  • To imprison. 

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