cave
A large hole in the side of a hill or mountain or in the ground is called a cavern or a cave. These natural formations can be created through various processes like erosion, weathering, or volcanic activity.
A Cave
A "canyon" is a large hole on the side of a hill or mountain or on the ground. Canyons are typically formed by the erosion of water or wind over time, creating deep valleys with steep sides.
A hole in the side of a hill or under the ground is known as Cave.
Holes underground are called caves. They could be in the side of a hill. The places where bears live are called dens. A bear's den may be in a cave but often is not.
A crater - I don't think there are any other answers possible!
The word you are looking for is "cave." A cave is a hollow opening or natural underground space that is typically large and found in hills, mountains, or the ground.
A large hole in the ground or in the side of a hill or mountain is commonly referred to as a "canyon." Canyons are typically formed by the erosion of water over time, creating deep, narrow valleys with steep sides. They can vary in size from small and narrow to large and expansive, such as the Grand Canyon in the United States.
A hill with a steep side is called a bluff. Bluffs can be found along coastlines or riverbanks, and they often offer scenic views due to their height and steepness.
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The lea side of a hill is the side that has a meadow called a lea. You probably mean the lee side, which is the side away from the wind.
Foxes live in an under ground burrow called a den. It is much like a rabbits hole with two openings for escaping. But a fox's den can be in the side of a hill, mountain, or cliff.