Mountain of denudation is another term for

A "Mountain of Denudation" is another term for a "Residual Mountain". A residual mountain is a type of mountain that remains after the surrounding land has been worn away by erosion. This means that over time, the wind, rain, and rivers have worn down the land surrounding the mountain, but the mountain itself has not been worn away. As a result, the mountain stands higher than the surrounding land and is referred to as a residual mountain.