78 Moby Thesaurus words for "split hairs": analyze, anatomize, around the bush, atomize, beat about, beg the question, bicker, boggle, cavil, change, chop logic, choplogic, contradistinguish, demarcate, demark, desynonymize, difference, differentiate, discriminate, disequalize, disjoin, distinguish, diversify, divide, dodge, draw the line, equivocate, evade, evade the issue, fence, hedge, individualize, individuate, make a distinction, mark, mark off, mark out, mark the interface, modify, mystify, nitpick, obscure, palter, parry, particularize, personalize, pick nits, pick out, prevaricate, pussyfoot, quibble, refine a distinction, screen, screen out, segregate, select, separate, set a limit, set apart, set off, sever, severalize, shift, shuffle, shy, sidestep, sieve, sieve out, sift, sift out, sort, sort out, specialize, subdivide, subtilize, tergiversate, vary, winnow

Source: Moby Thesaurus II by Grady Ward, 1.0