What is the difference between displacement and procedural?
These are two features that can be used in generating textures, but they can complement each other.
Displacement can be procedurally created, but it can also be created via an image.
it is an evolution of the bump map, but instead of being an image that generates only shadow effects, a new geometry is generated.
Procedural can be applied to different fields not only in computer graphics, in a nutshell it is an algorithm that automatically generates a result controlled by various parameters.
So you can procedurally generate a displacement on a mesh,
but you can also generate a mesh or series of objects in a procedural way.
Procedural refers to a generic procedure, while the displacement refers to a specific characteristic.
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“What is the difference between a cat and a house ?”
Your question is a bit strange
Perhaps you want to ask their individual definition instead of a comparison? 
In order to learn, it’s important to ask ourselves the good questions
or simply, do your research, for brain atrophy is already showing…