The term 'Parts of Chains' refers to the various components that make up a chain. In this case, the crossword solution is MOTELS, which are a type of lodging facility that is typically part of a chain of hotels. MOTELS are usually located near highways and offer convenient access to travelers. They often provide amenities such as swimming pools, restaurants, and other services. MOTELS are an important part of many hotel chains, providing travelers with a convenient and affordable place to stay.