There are various names, but possibly most common is the 'peak'
the peek of a mountain
Snow or Ice
peak
snow
a snow mountain top
peak
It is called a summit
atoll
Snoweshoe Mountain is not the name of a mountain, but of the ski resort on the mountain in Snowshoe. The mountain is Cheat Mountain and it has a top elevation of 4,848 feet.
The mountain with the flat top that presides over Cape Town; one of the world's most beautiful cities is Table Mountain.
top of mountain
The word you need may be 'plateau'
The Himalayas is the largest mountain chain in the world. Nine of the top ten tallest mountains in the world are located in this mountain range.
at the top of the mountain you plat sled racing
The summit of the mountain is at the top.
A mountain peak is the top of a mountain.