There are several synonyms for the phrase "thumping tub for," which refers to a large container used for washing or soaking items. Some alternative terms include "soaking tank," "laundry vat," and "washbasin." Other options include "tub basin," "cleansing container," and "washing reservoir." These descriptive terms can be helpful when trying to communicate about specific types of vessels, such as a cement mixing tub or a plastic laundry tub. Depending on the context of your conversation, some of these synonyms may be more appropriate than others. Consider the material, size, and intended use of the container when selecting the most fitting term.