noun
spire
SPY-er/ˈspaɪər/
A tall structure or peak that narrows to a point.
The church spire rises high above the surrounding brick buildings.

Etymology
Old English spir described a plant's shoot or tapering stalk. The architectural sense carries that slender, pointed shape into the tall tapering top of a tower or roof.
In context
At the highest point of the main hall was a spire, and embedded at the spire s tip was a sphere emitting a soft white light
More examples
- Tall spires of rock rise from the desert floor.
- Each castle tower ends in a slender spire.
- Workers repair the copper covering on the spire.
Forms
spire · spires