Synonyms of griper

1 Syllable
crab, bear, crank, bug, grouch, grump
2 Syllables
grouser, sulkers, grouches, sourpuss, kicker, grouched, growler, crosspatch, grumbler, moaner, whiner, sulker
3 Syllables
malcontent, curmudgeon, complainer, mutterers, murmurer, crybaby, mutterer, faultfinder, bellyacher, sorehead