The Collaborative International Dictionary of English v.0.48:

Whiz \Whiz\, v. i. [imp. & p. p. Whizzed; p. pr. & vb. n.
   Whizzing.] [Of imitative origin. ???. Cf. Whistle, and
   Hiss.]
   To make a humming or hissing sound, like an arrow or ball
   flying through the air; to fly or move swiftly with a sharp
   hissing or whistling sound. [Written also whizz.]
   [1913 Webster]

         It flew, and whizzing, cut the liquid way. --Dryden.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Whiz \Whiz\, n.
   A hissing and humming sound.
   [1913 Webster]

         Like the whiz of my crossbow.            --Coleridge.
   [1913 Webster]

WordNet (r) 3.0 (2006):

whiz
    n 1: someone who is dazzlingly skilled in any field [syn: ace,
         adept, champion, sensation, maven, mavin,
         virtuoso, genius, hotshot, star, superstar,
         whiz, whizz, wizard, wiz]
    2: a buzzing or hissing sound as of something traveling rapidly
       through the air; "he heard the whiz of bullets near his head"
    v 1: make a soft swishing sound; "the motor whirred"; "the car
         engine purred" [syn: whizz, whiz, whirr, whir,
         birr, purr]

Moby Thesaurus II by Grady Ward, 1.0:

143 Moby Thesaurus words for "whiz":
   ace, adept, assibilate, assibilation, ball the jack, barrel, beaut,
   birr, bombilate, bombinate, boom, bowl along, breeze, breeze along,
   brush, bullet, bum, burr, buzz, clip, corker, crackerjack,
   cut along, dab, dabster, daisy, dandy, darb, dilly, dream, drone,
   dust, effervesce, effervescence, effervescing, first-rater, fizz,
   fizzle, fizzling, fleet, flit, fly, fly low, foot, frication,
   frictional rustling, genius, go fast, good hand, great, highball,
   hiss, hissing, honey, hum, humdinger, hush, hushing, killer-diller,
   knockout, lisp, lollapaloosa, lulu, magician, mahatma, make knots,
   man of genius, master, master hand, mastermind, nip,
   outstrip the wind, past master, peach, pip, pippin, pour it on,
   practiced hand, prodigy, professional, purr, rhonchus, rip, sage,
   scorch, shush, shushing, sibilance, sibilate, sibilation, siffle,
   sigmatism, siss, sissing, sizz, sizzle, sizzling, skilled hand,
   skim, sneeze, sneezing, sniff, sniffle, snore, snort, snuff,
   snuffle, speed, spit, splutter, sputter, squash, squelch, squish,
   star, sternutation, stertor, storm along, superstar, sweep,
   sweetheart, swish, tear, tear along, the nuts, thrum,
   thunder along, topnotcher, virtuoso, wheeze, whir, whirl, whish,
   whisk, whisper, whistle, whistling, white noise, whoosh, wizard,
   zing, zip, zoom