"Top of the heap" is an idiomatic phrase that describes a position of dominance or superiority. Some common synonyms for this phrase include "king of the hill," "cream of the crop," "top dog," "numero uno," "the best of the best," "champion," "ultimate," "supreme," "preeminent," "outstanding," "first-rate," and "peerless." Each of these synonyms conveys a similar sense of excellence and achievement, but some may be more appropriate in certain contexts than others. For example, "king of the hill" may be more applicable to a competitive situation, while "cream of the crop" may be more fitting for a discussion about high-quality products or services.