The Collaborative International Dictionary of English v.0.48:

Logomachist \Lo*gom"a*chist\, n. [See Logomachy.]
   One who contends about words.
   [1913 Webster]

WordNet (r) 3.0 (2006):

logomachist
    n 1: someone given to disputes over words [syn: logomach,
         logomachist]