Look at a mountain.

It has three parts.

What is the bottom of a mountain?

It is called the foot of the mountain.

What is the side of a mountain?

It is called the face of the mountain.

What is the top of a mountain?

It is called the peak of the mountain.

Words

part 部分

a piece of feature of something such as an object, area, event, or period of time

bottom 底部

the lowest part of something