The Collaborative International Dictionary of English v.0.48:

Snore \Snore\ (sn[=o]r), v. i. [imp. & p. p. Snored
   (sn[=o]rd); p. pr. & vb. n. Snoring.] [OE. snoren, AS.
   snora a snoring; akin to LG. snoren, snorken, snurken, to
   snore, D. snorken, G. schnarchen to snore, schnarren to
   rattle, MHG. snarren, Sw. snarka to snore, Icel. snarka to
   sputter, fizzle. Cf. Snarl to growl, Sneer, Snort. See
   Snoring.]
   To breathe with a rough, hoarse, nasal voice in sleep.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Snore \Snore\, n.
   A harsh nasal noise made in sleep.
   [1913 Webster]

WordNet (r) 3.0 (2006):

snore
    n 1: the rattling noise produced when snoring
    2: the act of snoring or producing a snoring sound [syn:
       snore, snoring, stertor]
    v 1: breathe noisily during one's sleep; "she complained that
         her husband snores" [syn: snore, saw wood, saw logs]

Moby Thesaurus II by Grady Ward, 1.0:

138 Moby Thesaurus words for "snore":
   Aqua-Lung, artificial respiration, aspiration, assibilate,
   assibilation, asthmatic wheeze, belch, blare, blat, blow, bray,
   breath, breath of air, breathe, breathe hard, breathe in,
   breathe out, breathing, broken wind, burr, buzz, cackle, caw,
   chirr, clang, clangor, clank, clash, cough, craunch, croak, crump,
   crunch, doze, drowse, effervesce, effervescence, effervescing,
   exhalation, exhale, exhaust, expel, expiration, expire,
   exsufflation, fizz, fizzle, fizzling, frication,
   frictional rustling, gasp, grind, groan, growl, grumble, gulp,
   hack, hiccup, hiss, hissing, huff, hush, hushing, inhalation,
   inhalator, inhale, inspiration, inspire, insufflation, iron lung,
   jangle, jar, lisp, mouth-to-mouth resuscitation, nap, oversleep,
   oxygen mask, oxygen tent, pant, puff, rasp, respiration, respire,
   rhonchus, saw logs, saw wood, scranch, scrape, scratch, scrunch,
   scuba, shush, shushing, sibilance, sibilate, sibilation, siffle,
   sigh, sigmatism, siss, sissing, sizz, sizzle, sizzling, sleep,
   sleep soundly, slumber, snark, snarl, sneeze, sneezing, sniff,
   sniffle, snoring, snort, snuff, snuffle, spit, splutter, sputter,
   squash, squelch, squish, sternutation, stertor, suspiration, swish,
   take a nap, twang, wheeze, whish, whistle, whistling, white noise,
   whiz, whoosh, wind, zip