Potter's earth, a fine-grained substance used by potters for shaping and firing clay, is also known by a variety of synonyms. Some of these include ball clay, kaolin, porcelain clay, and terra cotta clay. Ball clay, while similar to kaolin, has a higher plasticity and is often used for sculpting. Porcelain clay, on the other hand, is more refined and used for making high-quality porcelain. Terra cotta clay is a type of raw clay that is fired at a low temperature and commonly used for making plant pots and other decorative objects. These synonyms refer to different variations of clay that can be used by potters to create their works of art.