"Commercial center" is a commonly used term to describe a bustling hub of commerce and activity. However, there are many excellent synonyms that could be used to describe a similar location. Some possible options could include "shopping district," "business district," "downtown," "mercantile area," "financial district," "retail hub," or "trade center." Each of these options conveys a slightly different nuance, but all could be used to describe a dynamic location where people come together to conduct transactions, shop, or work. By using a synonym, writers can add variety and interest to their descriptions, making their prose more engaging and effective.