IPA: /ˈbʊlˌpɛn/
KK: /ˈbʊlˌpɛn/
A designated area where relief pitchers warm up during a baseball game, or a space in an office with shared workspaces for employees.
The coach called for a pitcher from the bullpen to warm up before the next inning.
Bullpen → The word is formed from "bull" (from Old English "bula", meaning a male bovine) and "pen" (from Old English "penn", meaning an enclosure). The term "bullpen" originally referred to an enclosure for bulls, and in modern usage, it describes a designated area for relief pitchers in baseball.
Think of a 'bull' being kept in an 'enclosure' — that's how you can remember that a bullpen is a place where pitchers are kept ready to play.
No commonly confused words.