Lamellibranch is a term that refers to bivalve mollusks, such as clams and oysters, that have hinged shells or valves. If you're looking for synonyms for this term, there are several options to choose from. One word that is often used interchangeably with lamellibranch is bivalve, which refers to any mollusk that has two shells. Another synonym for lamellibranch is pelecypod, which is actually a more technical term that is often used by scientists and researchers. Other synonyms for lamellibranch include shellfish, mollusks, and clams. No matter which term you choose to use, all of these words are accurate descriptions of the types of creatures that fall into the category of lamellibranchs.