bullpen vs detention centre

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. 

detention centre

noun
  • A concentration camp. 

  • An immigration detention facility; a facility in which people who have attempted to enter Australia without prior authorisation are detained, pending a decision on whether they are to be accepted as refugees or returned to their country of origin. 

  • A facility in which people are detained (held in custody); a jail. 

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