Synonyms of grouch

1 Syllable
crab, bear, crank, bug, grump, grinch, kvetch
2 Syllables
grouser, spoilsport, marplot, pouting, grumbled, griping, doomsdayer, sourpuss, mutters, kicker, mutter, killjoy, growler, crosspatch, grumbler, moaner, whiner, griper, whiners, moaners
3 Syllables
sniveler, malcontent, curmudgeon, snivelers, muttering, dampener, muttered, faultfinder, bellyacher, sorehead