apex
AY-peksnounMeaning the top or highest point, often a pointed tip
Memory hook APE-X: the APE on the very tip. A cheeky ape scrambles up to the pointed tip of the pyramid and waves: he has reached the apex.
The lion is called an apex predator because no other animal hunts it.
In context The pyramid narrowed as it rose, and at its apex, the very tip, the builders set a single gleaming capstone.
Similar peak, summit, top
Opposite bottom, low point, rock bottom
From Latin apex, “tip, top.”