Quibbler

(n.) One who quibbles; a caviler; also, a punster.

Thesaurus Entries

belittler, captious critic, carper, caviler, censor, censurer, common scold, critic, criticizer, equivocator, faultfinder, frondeur, hairsplitter, hedger, momus, mystificator, mystifier, nitpicker, obscurantist, palterer, pettifogger, picayune critic, prevaricator, pussyfoot, pussyfooter, scold, shuffler, smellfungus, tergiversator