The term 'Parts of Spectacles' can refer to the two main components of eyeglasses, which are the lenses and the RIMS. The RIMS, which are also known as frames, are the four-letter word that is the solution to the crossword puzzle. The RIMS are the part of the glasses that hold the lenses in place and provide support for the glasses. They come in a variety of shapes, sizes, and materials, and can be made from metal, plastic, or other materials.