What is the difference between wing wall and retaining wall in water conservancy project?

This is a technical specification, which belongs to terminology. Wing wall is a common splayed wing wall, which is widely used in tunnel entrance and exit, even distorted. Crossing the water is to ensure the stability and smoothness of the entrance and exit. Retaining walls are generally retaining walls. I have seen more types of counterweight, which are relatively straight and less bent and twisted, mainly to ensure slope stability and facilitate construction.