A lintel is a horizontal structure used to support the weight of a wall or arch above an opening, such as a door or window. There are several synonyms for the word lintel, including beam, header, architrave, or transom. A beam is a long, sturdy piece of wood or metal used to support weight and spanning a distance. Header refers specifically to the beam at the top of a door or window frame, while architrave refers to the decorative molding surrounding the frame. A transom is a horizontal beam or bar that separates a door from a window above it. Whether it's called a lintel, beam, or header, this important architectural element plays a crucial role in the stability and aesthetics of a building.