The word "linings" refers to the materials used to cover the inner surface of objects such as clothing, bags, and shoes to provide comfort, insulation, and protection. Synonyms for this word can include materials such as padding, insulation, backing, coating, and cushioning. These materials are often made from various types of fabric, foam, or synthetic materials. Other related words that can be used as synonyms for "linings" include underlay, interlining, and inner layer. These synonyms are often used interchangeably depending on the specific context in which the term is being used.