The term 'WINDOW LEDGE' is composed of two words. The first word, 'WINDOW', is a noun that refers to an opening in the wall of a building or vehicle that allows light and air to enter and is usually fitted with glass or other transparent material in a frame. The second word, 'LEDGE', is a noun that refers to a narrow shelf or projection from a wall, especially one that is used to display items. Together, the term 'WINDOW LEDGE' refers to a shelf or projection from a WINDOW. The crossword solution for this term is 'SILL', which is a noun that refers to the flat base or bottom part of a WINDOW frame.