Which term best defines something that carries?

The term that best defines something that carries is "Vehicle." A vehicle is traditionally understood as a means of transport, which is specifically designed to carry people or goods from one location to another. This definition clearly aligns with the general function of carrying something across distances, whether it's taxis, buses, trucks, or even bicycles.

While "carrier," "conveyor," and "transport" can also be related to the notion of carrying, they each have distinct and narrower applications. A carrier often refers to a person or an entity that transports something but does not inherently denote a vehicle in the traditional sense. A conveyor tends to refer to a specific type of equipment designed to handle materials, especially in industrial scenarios, which again does not have the broad applicability of "vehicle." The term "transport" is more of an action or concept pertaining to the moving of goods or persons, rather than the definitive nature of a medium or device that performs the carrying.

Thus, “vehicle” encompasses a wide range of structures and modes specifically created to facilitate the act of carrying, which makes it the most appropriate term in this context.