When we say "top of the world", we often refer to a feeling of accomplishment or achievement. However, there are many different ways to express this feeling. Some synonyms for "top of the world" include: at the summit, the pinnacle of success, on top of the game, the zenith of achievement, the highest point, the climax, the peak of excellence, the apogee, the crowning glory, the apex of power, and the acme of triumph. Using these alternative phrases can add variety to your language and help you express yourself more accurately and precisely. Whatever term we use, the sentiment is always one of elation and pride at having reached the very top.