The Collaborative International Dictionary of English v.0.48:

Scorner \Scorn"er\, n.
   One who scorns; a despiser; a contemner; specifically, a
   scoffer at religion. "Great scorners of death." --Spenser.
   [1913 Webster]

         Surely he scorneth the scorners: but he giveth grace
         unto the lowly.                          --Prov. iii.
                                                  34.
   [1913 Webster]

WordNet (r) 3.0 (2006):

scorner
    n 1: a person who expresses contempt by remarks or facial
         expression [syn: sneerer, scorner]