WordNet (r) 3.0 (2006):

taps
    n 1: (military) signal to turn the lights out [syn: taps,
         lights-out]

Moby Thesaurus II by Grady Ward, 1.0:

48 Moby Thesaurus words for "taps":
   Angelus, Angelus bell, alarm, alarum, battle cry, bay, beep,
   birdcall, blare, blast, blat, bray, bugle call, burial,
   burial at sea, burying, call, cortege, dead march, deep six, dirge,
   fanfare, flourish of trumpets, funeral, funeral procession, honk,
   last post, moose call, muffled drum, peal, rallying cry,
   rebel yell, reveille, shriek, squeal, summons, tantara, tantarara,
   tarantara, tattoo, toot, tootle, trumpet, trumpet blast,
   trumpet call, tweedle, war cry, whistle