WordNet (r) 3.0 (2006):

stertor
    n 1: the act of snoring or producing a snoring sound [syn:
         snore, snoring, stertor]

Moby Thesaurus II by Grady Ward, 1.0:

82 Moby Thesaurus words for "stertor":
   Aqua-Lung, artificial respiration, aspiration, assibilation,
   asthmatic wheeze, breath, breath of air, breathing, broken wind,
   buzz, cough, effervescence, effervescing, exhalation, expiration,
   exsufflation, fizz, fizzle, fizzling, frication,
   frictional rustling, gasp, gulp, hack, hiccup, hiss, hissing, hush,
   hushing, inhalation, inhalator, inspiration, insufflation,
   iron lung, lisp, mouth-to-mouth resuscitation, oxygen mask,
   oxygen tent, pant, puff, respiration, rhonchus, scuba, shush,
   shushing, sibilance, sibilation, siffle, sigh, sigmatism, siss,
   sissing, sizz, sizzle, sizzling, sneeze, sneezing, sniff, sniffle,
   snore, snoring, snort, snuff, snuffle, spit, splutter, sputter,
   squash, squelch, squish, sternutation, suspiration, swish, wheeze,
   whish, whistle, whistling, white noise, whiz, whoosh, wind, zip