A fortified place; fort
A large fortified building or group of buildings with thick walls, usually dominating the surrounding country.
The definition of a bastion is a fortified place, or something or someone that holds firm to an idea or principle.
The definition of a stronghold is a place that has been secured tightly in case of attack, or a place where a particular belief or ideology is firmly believed and staunchly defended.
A person or thing that resembles a tower in height, strength, dominance, etc.
Find another word for citadel. In this page you can discover 14 synonyms, antonyms, idiomatic expressions, and related words for citadel, like: fortress, castle, watch-tower, bastion, fort, stronghold, temple, tower, rampart, mausoleum and fortification.