/ Thesaurus / B Synonyms of bull pen Find synonyms for: Noun1. bullpen, areausage: a place on a baseball field where relief pitchers can warm up during a game2. bullpen, detention cell, detention centre, cell, jail cell, prison cellusage: a large cell where prisoners (people awaiting trial or sentence or refugees or illegal immigrants) are confined together temporarilyWordNet 3.0 Copyright © 2006 by Princeton University. All rights reserved. Related Content Daily Word Quiz: loathe Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language