windward and leeward side(:
The sides of a mountain are called slopes. These slopes can vary in steepness and play a role in determining the overall shape and characteristics of the mountain.
Sides of a mountain/ship/hill.
plateau
The two sides of a mountain range are typically referred to as the windward side and the leeward side. The windward side faces the prevailing winds and receives more precipitation, while the leeward side is sheltered from the wind and tends to be drier.
The two sides of your brain are called the left and right hemispheres.
The two sides of a coin are called head and tail.
A PLANE has two sides
There is no such thing as an object with two sides.
A flattop mountain is called a mesa. Mesas are elevated landforms with flat tops and steep sides, often found in arid regions.
The structure that connects the two sides of your nose is called the nasal septum.
An angle consists of two rays called sides with a common endpoint called the vertex.
Each point of a polygon at which two sides intersect is called VERTEX