Shellfish is a term used to describe a variety of aquatic invertebrates, including SHRIMP (6 letters), WHELK (5 letters), MOLLUSC (7 letters), winkle (6 letters), SCALLOP (7 letters), ABALONE (7 letters), LOBSTER (7 letters), LIMPET (6 letters), CLAM (4 letters), MUSSEL (6 letters), PRAWN (5 letters), OYSTER (6 letters), NACRE (5 letters) and MOLLUSKS (8 letters). These animals are typically found in saltwater environments and have a hard outer shell. They are a popular food source in many cultures around the world.