#sound_wave__soundwave__acoustic_wave  (acoustics) a wave that transmits sound
  supertype:  undulation__wave  (physics) a progressive disturbance propagated without displacement of the medium itself
  subtype:  air_wave__airwave  a sound wave that is transmitted via air
  subtype:  shock_wave__shockwave  a region of high pressure travelling through a gas at a high velocity
     subtype:  sonic_boom__sonicboom  an explosive sound caused by the shock wave of an airplane traveling faster than the speed of sound; "a sonic boom follows an aircraft as a wake follows a ship"

No statement uses or specializes sound_wave; click here to add one.