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mountain
Basin
It is called perimeter.
It depends on the type of figure. If it is a 2D figure, then it is called area. If it is a 3D figure, then it is called volume.
gfg
mountain
A hill.
plateau
hill mountain plateau
Plateau.
Hill
If you are referring to baseball, the raised area is known as the pitcher's mound.
Yes, the word 'hill' is a noun, a word for a naturally raised area of land; a word for a thing.
mesa
range
A group of mountain slopes in one area is called a mountain range.