The term 15%-er refers to an AGENT, which is a five-letter word. An AGENT is a person or company that acts on behalf of another person or company in order to represent them in business transactions. Agents are often used in the real estate industry to represent buyers and sellers in the purchase and sale of property. They can also be used in other industries such as insurance, finance, and entertainment. Agents are responsible for negotiating deals, managing contracts, and ensuring that their clients' interests are protected.