WordNet (r) 3.0 (2006):

discotheque
    n 1: a public dance hall for dancing to recorded popular music
         [syn: disco, discotheque]

Moby Thesaurus II by Grady Ward, 1.0:

24 Moby Thesaurus words for "discotheque":
   amusement park, ballroom, cabaret, cafe, cafe chantant,
   cafe dansant, casino, dance floor, dance hall, dancing pavilion,
   entertainment industry, fun-fair, juke joint, night spot,
   nightclub, nitery, resort, roadhouse, show biz, show business,
   supper club, tavern, theater, watering place