grumbler

from WordNet (r) 3.0 (2006)

grumbler
    n 1: a person given to excessive complaints and crying and
         whining [syn: {whiner}, {complainer}, {moaner},
         {sniveller}, {crybaby}, {bellyacher}, {grumbler},
         {squawker}]

from The Collaborative International Dictionary of English v.0.48

Grumbler \Grum"bler\, n.
   One who grumbles.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

24 Moby Thesaurus words for "grumbler":
      bellyacher, complainant, complainer, crab, crank, croaker,
      crosspatch, faultfinder, frondeur, griper, grouch, grouser,
      growler, kicker, kvetch, malcontent, murmurer, mutterer,
      querulous person, reactionary, reactionist, rebel, sorehead,
      whiner

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