What term describes someone who acts as an intermediary on behalf of others for a fee or commission?

The term that describes someone who acts as an intermediary on behalf of others for a fee or commission is "Broker." A broker is typically more experienced and often holds a higher level of licensing than an agent. Brokers can operate independently, representing clients in various transactions, including buying, selling, or leasing properties. They facilitate these transactions and ensure that all processes adhere to legal requirements, which often involves negotiating terms and providing market insights to clients.

While an agent is validly an intermediary, they usually work under a broker's license and typically represent clients directly but do not operate independently like a broker. The term "Realtor" refers to a real estate professional who is a member of the National Association of Realtors and adheres to its standards, but it does not universally denote the role of an intermediary for a fee or commission. An investor is someone who purchases property with the intent of making a profit but does not inherently act as an intermediary on behalf of others. Hence, the most accurate answer to the question, highlighting the role of an intermediary for a fee or commission, is "Broker."