The Collaborative International Dictionary of English v.0.48:

parachuter \par"a*chut`er\, parachutist \par`a*chut"ist\, n.
   One who descends from a high altitude to the ground by means
   of a parachute, especially one who does so for sport or in a
   military operation.
   [PJC]

WordNet (r) 3.0 (2006):

parachuter
    n 1: a person who jumps from aircraft using a parachute [syn:
         parachutist, parachuter, parachute jumper]