There are several synonyms for the word "tooth shell" that can be used depending on the context. One such synonym is "tooth valve," which refers to the shell of a bivalve mollusk that resembles a tooth in shape. Another synonym is "tooth clam," which is a common name for a type of clam with a long, thin shell that resembles a tooth. In some regions, the term "toothed shell" may be used to describe any kind of shell with serrated edges or rough surfaces. Other synonyms for "tooth shell" include "dentalium," "toothed whelk," and "toothed snail." Each of these terms can be used to describe different types of shells, depending on their appearance and characteristics.