Terminology for Landslides:

Mass Wasting: the movement of Earth materials downslope as a result of the pull of gravity. Process by which mass movements occur and erode the land surface

Mass Movements: Downhill movement of masses of soil, rocks, mud, or other unconsolidated (lose and uncemented) materials.

Landslide: term for mass-movements in general.The term landslide includes: Any perceptible downslope movement of bedrock, regolith, or a mixture of the two. Many different types of movement, materials, and triggering events may be involved in downslope mass movements of Earth material.