Stronghold

n.

1.

A fastness; a fort or fortress; fortfield place; a place of security.

Noun

1.

stronghold - a strongly fortified defensive structure Synonyms: fastness

acropolis, asylum, bastion, beachhead, bird sanctuary, blockhouse, bridgehead, bulwark, bunker, castle, citadel, donjon, fasthold, fastness, forest preserve, fort, fortification, fortress, game preserve, game sanctuary, garrison, garrison house, harbor, harbor of refuge, harborage, haven, hold, keep, martello, martello tower, mote, motte, peel, peel tower, pillbox, port, post, preserve, rath, redoubt, refuge, safe haven, safehold, sanctuary, snug harbor, strong point, tower, tower of strength, ward