ROGET THESAURUS
libeler
Detractor
N
detractor, reprover, censor, censurer, cynic, critic, caviler, carper, word-catcher, frondeur, barracker, defamer, backbiter, slanderer, Sir Benjamin Backbite, lampooner, satirist, traducer,
libeler, calumniator, dawplucker, Thersites, Zoilus, good-natured friend, reviler, vituperator, castigator, shrew, muckraker, disapprover, laudator temporis acti, black-mouthed, abusive.