WordNet (r) 3.0 (2006):

vibraphone
    n 1: a percussion instrument similar to a xylophone but having
         metal bars and rotating disks in the resonators that
         produce a vibrato sound [syn: vibraphone, vibraharp,
         vibes]

Moby Thesaurus II by Grady Ward, 1.0:

36 Moby Thesaurus words for "vibraphone":
   battery, bells, bones, castanets, celesta, chime, chimes, clappers,
   crash cymbal, cymbals, finger cymbals, gamelan, glockenspiel, gong,
   handbells, idiophone, lyra, maraca, marimba, metallophone,
   orchestral bells, percussion, percussion instrument, percussions,
   percussive, rattle, rattlebones, sizzler, snappers, tam-tam,
   tintinnabula, tonitruone, triangle, tubular bells, vibes,
   xylophone