summit of Mt. Fuji; peak of Mt. Fuji
Refers specifically to the top of Mount Fuji, often used in contexts of climbing, weather, or geography.
The sunrise from the summit of Mt. Fuji is beautiful.
The temperature at the peak of Mt. Fuji was below freezing.
富士山 refers to the entire mountain, while 富士山頂 specifies only the summit.
山頂 is a general term for a mountain summit; 富士山頂 is specific to Mt. Fuji.
Compound of 富士 (Fuji) + 山頂 (mountain summit).