A gable end is the triangular part of a building wall that rests between the two sloping sides of a roof. There are several synonyms used to describe this architectural feature, including pediment, apex, dormer, and eave. A pediment is a triangular section located above a doorway or window, while an apex refers to the uppermost point of a roof ridge. A dormer is a structure that projects from a sloping roof and provides extra space for a window or doorway. Finally, the eave is the overhanging edge of a roof that covers the gable end. Each of these terms is commonly used in the construction industry and can help professionals communicate about specific architectural details.