Bentonite is a type of clay that is often used for its absorptive and adhesive properties. However, there are a variety of synonyms for this versatile substance. One of the most common names for bentonite is montmorillonite, which refers to the specific mineral that is found within the clay. Other synonyms include fuller's earth, which is a type of clay that is similar to bentonite and is often used for its absorbing qualities. Kaolin, sometimes called china clay, is another type of clay that shares many characteristics with bentonite. Other less common synonyms include diatomaceous earth, attapulgite, and zeolite.