apex
Definitions
The top or highest part of something, especially one forming a point.
The climax or peak of a process, career, or development.
The pointed end of an object or a geometric figure.
Examples
The mountain climber finally reached the apex of the peak after a grueling three-day ascent.
At the apex of his career, the athlete was considered the greatest player in the history of the sport.
The predator sits at the apex of the food chain, with no natural enemies in its environment.