Hairsplitter

(n.) One who makes excessively nice or needless distinctions in reasoning; one who quibbles.

Thesaurus Entries

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