faultfinder

Plural: faultfinders

Noun

• someone who is critical of the motives of others
• A person who finds fault

Synonyms

cynic, bellyacher, carper, castigator, caviler, censurer, complainer, crabber, critic, criticizer, faultfinder, findfault, grouch, grumbler, hafter, kvetcher, latrant, nitpicker, pettifogger, pick-fault, quibbler, scolder, smellfungus, sourpuss, squeaky wheel, troublemaker, vituperator, whiner, whinger, whining Willy