Realtor

n. real estate agent who is a member of the National Association of Real Estate Boards

The National Association of Realtors (NAR), whose members are known as Realtors (rē(ə)ltər; -ˌtôr), is North America's largest trade association representing over 1 million members (as reported in 2006), including NAR's institutes, societies, and councils, involved in all aspects of the residential and commercial real estate industries. NAR also functions as a Self Regulatory Organization for real estate brokerage. In the UK the equivalent is the NAEA.
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Noun
1. a person who is authorized to act as an agent for the sale of land; "in England they call a realtor a land agent"
(synonym) real estate broker, real estate agent, estate agent, land agent, house agent
(hypernym) agent, factor, broker

A registered trade name that can be used by members of real estate boards affiliated with the National Association of Realtors (NAR) who are trained and licensed to assist clients in buying and selling real estate.