Big top is a term used to describe the main tent used for circuses and other large events. There are several other synonyms that can be used instead of big top, such as circus tent, main tent, center ring, and grand tent. Other phrases can also be used to describe the large areas where circuses are held, such as the arena, performance center, or showgrounds. These synonyms can be helpful when writing about circuses or other large events, as they can add variety and interest to your writing. Next time you need to describe a big top, consider using one of these synonyms to add a unique touch.