WordNet (r) 3.0 (2006):

Realtor
    n 1: a real estate agent who is a member of the National
         Association of Realtors

Moby Thesaurus II by Grady Ward, 1.0:

21 Moby Thesaurus words for "Realtor":
   bill broker, broker, cambist, cotton broker, diamond broker,
   discount broker, estate agent, furniture broker, grain broker,
   hotel broker, insurance broker, land broker, money broker,
   money changer, mortgage broker, note broker, pawnbroker,
   real estate agent, real estate broker, ship broker, stockbroker