cavern
Sometimes, in names and especially by show-cave owners to impress intending visitors; but the normal word in anyy English-language caving speech or text is simply "Cave" irrespective of type and dimensions.
A large cave is called a cavern. These typically form in karst regions from the dissolution of soluble rocks such as limestone. Caverns can vary greatly in size, with some containing vast chambers and intricate formations like stalactites and stalagmites.
A cave system - as simple as that. :-) Sometimes the system is named as So-&-So Cavern, especially if part of it has been modified to form a show-cave, but the formal and most used term is still "cave".
Cave entrances are typically called cave mouths, cave openings, or cave portals.
The top of a cave is called the entrance or the mouth of the cave. It is the opening through which one can access the interior of the cave.
A cave entrance is commonly referred to as a cave mouth or cave opening.
The roof of a cave is referred to as the "ceiling" or "overhang".
cave
Carlsbad Caverns.
a sea cave
The Sarawak Chamber is the largest known cave chamber in the world. The Sarawak Chamber is a cave that is located underground in the country of Malaysia.
A grotto is a large cave-like area, often next to water.
Cave.
A cave system - as simple as that. :-) Sometimes the system is named as So-&-So Cavern, especially if part of it has been modified to form a show-cave, but the formal and most used term is still "cave".
Cave in.
A cave system - as simple as that. :-) Sometimes the system is named as So-&-So Cavern, especially if part of it has been modified to form a show-cave, but the formal and most used term is still "cave".
I think it is called Zeus' cave ;)
The Cave of Wonders
Cave entrances are typically called cave mouths, cave openings, or cave portals.