The term 'window frame' is composed of four parts: SASH (4 letters), SILL (4 letters), casing (6 letters) and CASEMENT (8 letters). A SASH is the part of a window that holds the glass in place. The SILL is the bottom part of the window frame, which rests on the outside wall of the building. The casing is the trim around the window frame, which gives it a finished look. Finally, a CASEMENT is a type of window that opens outward, usually with a crank mechanism. All of these components together make up a window frame.