The crossword solution for the term SILENT SORT is CLAM. A CLAM is a type of mollusk that lives in saltwater and freshwater habitats. Clams are filter feeders, meaning they feed by filtering particles from the water. They have two shells that are connected by a hinge and can be opened and closed. Clams are known for their ability to remain silent and still, which is why they are often used as an example of a silent sort.