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1. roof A type of roof where all sides slope downwards to the walls.
3. A triangular portion of an end wall between the edges of a sloping roof.
5. Small top story within a roof. The story above the main entablature of a classical façade.
9. A spiral, scroll-like ornament that forms the basis of the Ionic order.
11. Window or element above a door but within its vertical frame.
13. A freestanding pavilion structure often found in parks, gardens and public areas.
14. A large and high circular hall or room in a building, usually surmounted by a dome.
15. The cornerstones of brick or stone walls.
17. Brickwork with overlapping bricks. Types of bond include stretcher, English, header, Flemish, garden wall, herringbone, basket, American, and Chinese.
18. Passage or walkway covered over by a succession of arches or vaults supported by columns. Blind arcade or arcading: the same applied to the wall surface.
21. In classical architecture is an exedra or an apse that has been reduced in size, retaining the half-dome heading usual for an apse.

2. An upright support for a superstructure, such as an arch or bridge.
4. Weight-bearing member made of wood, stone, or metal that overhangs a wall.
6. A structure made up of one or more triangular units made from straight members of wood or metal which is used to support a structure, as in a roof or bridge.
7. The architectural piece at the crown of a vault or arch and marks its apex, locking the other pieces into position.
8. A framework placed above a window.
10. The topmost member of a column (or pilaster).
12. A structural element that transmits, through compression, the weight of the structure above to other structural elements below.
13. A symmetrical two-sided roof with two slopes on each side.
16. window Window of one or more storeys projecting from the face of a building. Canted: with a straight front and angled sides. Bow window: curved. Oriel: rests on corbels or brackets and starts above ground level; also the bay window at the dais end of a medieval great hall.
19. Subsidiary space alongside the body of a building, separated from it by columns, piers, or posts
20. A curved structure capable of spanning a space while supporting significant weight.