In architecture, a cornice is generally any horizontal decorative moulding that crowns a building or furniture element. Examples include the cornice over a door or window, around the top edge of a ped
Illustrations of various examples of ancient Egyptian cornices, all of them having cavettos
Cornice of Maison Carrée (Nîmes, France), a Roman temple in the Corinthian order, with dentils nearest the wall.
A wide box cornice with lookouts
Crown molding is a cornice of decorative molding installed where an interior wall meets the ceiling, and over doors, windows, pilasters and cabinets.
Cornice
…over a door or window, around the top edge of a pedestal, or along the top of an interior wall. A simple cornice may be formed with a crown, as in crown moulding atop an interior wall or above kitchen cabinets or a bookcase. A projecting cornice on a building has the function of diverting rainwater away from its…
The relief on this short 90-degree return of crown molding was back-cut with a coping saw
A compound crown molding built up out of several individual trim elements
Decorative pilaster of natural cherry hardwood topped with crown molding
Crown molding may be a complex build-up of multiple trim elements, in this case built-out slightly above a window with short 90-degree returns