A small tower extending above a building.

Roget 206: height, altitude, elevation; eminence, pitch; loftiness etc. adj.; sublimity.    tallness etc. adj.; stature, procerity^†; prominence etc. 250.    colossus etc. (size) 192; giant, grenadier, giraffe, camelopard.    mount, mountain; hill alto, butte [U.S.], monticle^†, fell, knap^†; cape; headland, foreland^†; promontory; ridge, hog's back, dune; rising ground, vantage ground; down; moor, moorland; Alp; uplands, highlands; heights etc. (summit) 210; knob, loma^†, pena [U.S.], picacho^†, tump^†; knoll, hummock, hillock, barrow, mound, mole; steeps, bluff, cliff, craig^†, tor^†, peak, pike, clough^†; escarpment, edge, ledge, brae; dizzy height.    tower, pillar, column, obelisk, monument, steeple, spire, minaret, campanile, turret, dome, cupola; skyscraper.    pole, pikestaff, maypole, flagstaff; top mast, topgallant mast.    ceiling etc. (covering) 223.    high water; high tide, flood tide, spring tide.    altimetry etc. (angel) 244^†; batophobia^†.    satellite, spy-in-the-sky.    ... show more

A self-contained weapons platform housing guns and capable of rotation.

synonyms: gun enclosure, gun turret.