Vertex
Part of speech: noun
Definition: The highest point of something. The highest surface on the skull. The highest point of something. # Informally; a corner. ## (angle) The common point of the two rays of the angle. ## (polygon) The meeting points of two sides. ## (polyhedron) The meeting point of three or more faces and an equal number of edges. ## (polytope) a point where the corners of three or more cells meet and connect to each other. ## (curve) a point on the curve with a local minimum or maximum of curvature. # One of the elements of a graph joined by zero or more edges to other vertices. A point in 3D space, usually given in terms of its x-, y-, and z-coordinates. The point where the surface of an optical element (e.g. lens) crosses the optical axis. (nuclear or particle physics) the interaction point. where the Prime Vertical meets the ecliptic in the west.
Apex
Part of speech: noun
Definition: The highest point of something.The moment of greatest success, expansion, etc.The topmost vertex of a cone or pyramid (in their conventional orientation).The pointed end of something.# The lowest part of the human heart.# The deepest part of a tooth's root.The end of a leaf, petal or similar organ opposed to the end where it is attached to its support; the tip.
Example sentence: I think 'Comic Book: The Movie' is the apex of my career in terms of making a personal statement that has significance to me and resonates with biographical detail about not only my career, but all the people that I've worked with in my career. All of it's riddled, on- and off-camera, with people I've known and worked with for decades.