Potter's earths, also known as pottery clays, refer to a type of clay that is commonly used for creating ceramics. However, there are many different types of clays that potter's earths can refer to, including earthenware, stoneware, porcelain, and more. Each type of clay has its unique characteristics, such as its plasticity, color, and firing temperature. Other synonyms for potter's earths include ball clay, fire clay, ceramic clay, and terra cotta. These various types of clays can be mixed together or used on their own to achieve particular properties in the final product, such as fine texture, high strength, or translucency.