Spire. A slender, pointed construction atop a building, often a church. The descriptive phrase conical roof could be applied.
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Crenellation is a feature of defensive architecture, most typically found on the battlements of medieval castles. A battlement is a low, defensive parapet. The act of crenellation is the cutting of crenels into a previously solid and straight parapet wall.
A battlement is the upper walled part of a castle or fortress. It's usually formed out of a low, narrow wall on top of the outermost protective wall of a fortress or castle. The word ''battlement'' traces to an old French term that means tower or turret, and the original use of battlements was for protection.
A bailey is the sturdy wall around a castle that keeps invaders out. The bailey of a medieval castle was usually built of stone. You might see a bailey — or the remains of one — if you tour a castle in England or France.