Shellder is a Pokemon species known for its bivalve-like appearance with its two-part shell. Its name is derived from the words shell and welder, presumably because of its shell-making abilities. There are very few synonyms for the word Shellder as it is a unique name, however, it is similar in appearance to other mollusk and bivalve creatures like oysters, mussels, and clams. It is also often associated with the water type and can be compared to other water creatures like Squirtle, Krabby, and Lapras. Despite its relatively uncommon name, Shellder has become a popular character in the Pokemon franchise, featuring prominently in the Pokemon anime and games.