The word zenithal describes something at its highest point or directly overhead. Some synonyms for zenithal include apex, acme, summit, top, peak, pinnacle, climax, and high point. These words are often used in conjunction with mountain climbing or reaching the highest point of achievement or success in one's career or personal life. Additionally, zenithal can also be used to describe the position of the sun directly overhead, with synonyms such as meridional and noonmark. Overall, synonyms for zenithal refer to the highest or most elevated point or position, indicating a state of excellence or accomplishment.