bullpen vs home plate

bullpen

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

  • The relief pitchers of a team collectively. 

  • A place for someone or something to get ready. 

  • An enclosed area used to hold bulls. 

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

home plate

noun
  • A flat, pentagonal, rubber object placed at the center of the batter's box, which is used as a basis for judging pitched strikes and balls, and the touching of which by a runner advancing from or past third base scores a run. 

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