exchanger

The word "exchanger" describes a person, place, or device that exchanges one thing for another. In everyday use, it can mean someone who changes money or trades goods. For example, a currency exchanger changes one kind of money into another, often for travelers or businesses.

The word is also widely used for machines and systems. A heat exchanger transfers heat from one fluid to another, and this is common in radiators, air-conditioning systems, and factories. In technical writing, similar uses appear in chemistry and biology, where the idea is still the same: something is being moved, traded, or converted.

Less often, the word can refer to a business or service that handles exchanges, especially money exchange. Overall, "exchanger" is not a general word for any person who gives something in return. It is usually used when exchanging is the person's job, the service's purpose, or the device's function.