sorehead

from WordNet (r) 3.0 (2006)

sorehead
    n 1: someone who is peevish or disgruntled

from The Collaborative International Dictionary of English v.0.48

Sorehead \Sore"head`\, n.
   One who is disgruntled by a failure in politics, or the like.
   [Slang, U.S.]
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

35 Moby Thesaurus words for "sorehead":
      Tartar, bear, bellyacher, complainant, complainer, crab, crank,
      croaker, crosspatch, dragon, faultfinder, feist, fire-eater,
      frondeur, fury, griper, grizzly bear, grouch, grouser, growler,
      grumbler, hothead, hotspur, kicker, kvetch, malcontent, murmurer,
      mutterer, querulous person, reactionary, reactionist, rebel,
      sourpuss, ugly customer, whiner