Blockhouse

Noun

 * 1) A sturdy military fortification, often of concrete, with gunports.
 * 2) A reinforced building from which to control hazardous operations, such as an explosion or a rocket launch.
 * 3) A temporary wooden fortification with a projecting upper story.

Thesaurus
acropolis, bastion, beachhead, box, bridgehead, bungalow, bunker, cabin, castle, chalet, citadel, cot, cote, cottage, donjon, fasthold, fastness, fort, fortress, garrison, garrison house, hold, keep, lodge, log cabin, love nest, martello, martello tower, mote, motte, peel, peel tower, pied-a-terre, pillbox, post, rath, safehold, snuggery, strong point, stronghold, tower, tower of strength, ward