wedge - something solid that is usable as an inclined plane (shaped like a V) that can be pushed between two things to separate them

headstone, keystone, key - the central building block at the top of an arch or vault

building, edifice - a structure that has a roof and walls and stands more or less permanently in one place; "there was a three-story building on the corner"; "it was an imposing edifice"

structure, construction - a thing constructed; a complex construction or entity; "the structure consisted of a series of arches"; "she wore her hair in an amazing construction of whirls and ribbons"

architecture - the discipline dealing with the principles of design and construction and ornamentation of fine buildings; "architecture and eloquence are mixed arts whose end is sometimes beauty and sometimes use"