Tartar, air a grievance, bear, beef, bellyache, bellyacher, bitch, clamor, complain, complainant, complainer, crab, crank, croak, croaker, crosspatch, dragon, faultfinder, feist, fire-eater, fret, fret and fume, frondeur, fury, fuss, gripe, griper, grizzly bear, groan, grouse, grouser, growl, growler, grumble, grumbler, grump, grunt, holler, hothead, hotspur, howl, kick, kicker, killjoy, kvetch, lodge a complaint, malcontent, mope, murmur, murmurer, mutter, mutterer, querulous person, raise a howl, reactionary, reactionist, rebel, register a complaint, scold, sorehead, sourpuss, spoilsport, squawk, sulk, take on, ugly customer, wet blanket, whiner, yap, yelp