castigator

1 a person given to harsh judgments and to finding faults even Broadway's most famously caustic castigator liked the play Synonyms carper, critic, caviler (or caviller), censurer, criticizer, disparager, faultfinder, hypercritic, knocker, niggler, nitpickerRelated 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

2 one who inflicts punishment in return for an injury or offense the principal seems to enjoy his role as the tireless castigator of classroom pranksters Synonyms avenger, nemesis, chastiser, punisher, scourge, vigilanteRelated Words revenger; redresser, righter; requiterNear Antonyms ransomer, redeemer, vindicator