bell gable - an extension of a gable that serves as a bell cote

corbie gable - (architecture) a gable having corbie-steps or corbel steps

pediment - a triangular gable between a horizontal entablature and a sloping roof

wall - an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure; "the south wall had a small window"; "the walls were covered with pictures"