There isn't a single specific term for the displacement between two bodies of rock. The term used depends on the context and the nature of the displacement. Here are a few possibilities:

* Fault: This is the most common term when the displacement is caused by geological movement along a fracture in the Earth's crust. The amount of displacement along a fault is called offset.

* Separation: This term can be used generally to describe any distance between two bodies of rock, regardless of the cause.

* Gap: This is a more informal term that can be used to describe a space between two bodies of rock.

* Dislocation: This term is sometimes used in geology to describe a displacement of rock layers, often caused by tectonic activity.

* Offset: This term is also used to describe the difference in elevation or position between two parts of a rock body that have been displaced, often along a fault.

To give you the most accurate term, I would need more information about the specific situation you're interested in. Please tell me:

* What kind of displacement are you talking about? (e.g., caused by a fault, erosion, etc.)

* What is the context of the displacement? (e.g., geological formation, construction project, etc.)

With more information, I can give you a more precise and relevant answer.