WordNet (r) 3.0 (2006):

razzing
    n 1: a cry or noise made to express displeasure or contempt
         [syn: boo, hoot, Bronx cheer, hiss, raspberry,
         razzing, razz, snort, bird]

Moby Thesaurus II by Grady Ward, 1.0:

50 Moby Thesaurus words for "razzing":
   banter, bantering, booing, catcalling, chaffing, derision,
   derisive, derisory, fleering, flippancy, flippant, fooling,
   grinning, hazing, hissing, hooting, jeering, jesting, joking,
   jollying, joshing, kidding, leering, levity, mockery, mocking,
   panning, quizzical, ragging, railing, raillery, rallying, ribbing,
   ridicule, ridiculing, roasting, scoffing, smart, smart-aleckiness,
   smart-alecky, smart-ass, smartness, smirking, sneering, snickering,
   sniggering, snorting, taunting, teasing, twitting