Yes, it is essential to distinguish between geomorphic agents and geomorphic processes. A process is a force applied on earth materials affecting them, such as weathering, mass wasting, erosion and deposition. An agent is a mobile medium like running water, glaciers, wind, or waves that removes, transports and deposits earth materials.

The distinction helps understand that processes are the forces acting on materials, while agents are the mediums through which these forces operate. Gravity, for instance, acts as a directional force activating all downslope movements and causing stresses on earth materials.

However, geomorphic processes and geomorphic agents, especially exogenic ones, are one and the same unless stated separately. This is because agents become mobile due to gradients and carry out erosion, transportation and deposition.