murmurer

from WordNet (r) 3.0 (2006)

murmurer
    n 1: a person who speaks softly and indistinctly [syn:
         {mutterer}, {mumbler}, {murmurer}]

from The Collaborative International Dictionary of English v.0.48

Murmurer \Mur"mur*er\, n.
   One who murmurs.
   [1913 Webster]

from Moby Thesaurus II by Grady Ward, 1.0

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

[email protected]