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.
Peak
Part of speech: verb
Definition: To reach a highest degree or maximum.
Part of speech: noun
Definition: A point; the sharp end or top of anything that terminates in a point; as, the peak, or front, of a cap.The top, or one of the tops, of a hill, mountain, or range, ending in a point; often, the whole hill or mountain, esp. when isolated; as, the Peak of Teneriffe.The upper aftermost corner of a fore-and-aft sail; -- used in many combinations; as, peak-halyards, peak-brails, etc.The narrow part of a vessel's bow, or the hold within it.The extremity of an anchor fluke; the bill.For sine waves, the point at which the value of y is at its maximum.
Example sentence: Serena and I have done some great career planning, and we're playing really at the peak of our tennis right now. I think tennis has been a sport where people play this insane schedule from 14 years old, so of course at 26, it's over. We've really paced ourselves.