WordNet (r) 3.0 (2006):

whish
    v 1: make a sibilant sound
    2: move with a whishing sound; "The car whished past her"

Moby Thesaurus II by Grady Ward, 1.0:

64 Moby Thesaurus words for "whish":
   assibilate, assibilation, bullet, buzz, crinkle, effervesce,
   effervescence, effervescing, fizz, fizzle, fizzling, fleet, flit,
   fly, frication, frictional rustling, hiss, hissing, hush, hushing,
   lisp, rhonchus, rustle, shush, shushing, sibilance, sibilate,
   sibilation, siffle, sigmatism, siss, sissing, sizz, sizzle,
   sizzling, sneeze, sneezing, sniff, sniffle, snore, snort, snuff,
   snuffle, speed, spit, splutter, sputter, squash, squelch, squish,
   stave, sternutation, stertor, swish, wheeze, whirl, whisk, whisper,
   whistle, whistling, white noise, whiz, whoosh, zip