nitpicker

a person given to harsh judgments and to finding faults a tiresome nitpicker who seems to think that I can't do anything right Synonyms carper, castigator, caviler (or caviller), censurer, criticizer, disparager, faultfinder, hypercritic, knocker, niggler, criticRelated Words condemner (or condemnor), denouncer; belittler, decrier, denigrator, derider, detractor; assailant, attacker, crucifier; criticaster, hairsplitter, pettifogger, quibbler; admonisher, haranguer, railer, ranter, rebuker, reproacher, reprover, scold, upbraider; bellyacher, complainer, crybaby, fusser, griper, grouch, grouser, grumbler, whinerNear Antonyms commender, praiser