Source : Webster's Revised Unabridged Dictionary (1913)

Necromancer \Nec"ro*man`cer\, n.
   One who practices necromancy; a sorcerer; a wizard.

Source : WordNet®

necromancer
     n 1: one who practices magic or sorcery [syn: {sorcerer}, {magician},
           {wizard}]
     2: one who practices divination by conjuring up the dead