Synonyms of 'fortress'
castleDictionary, fort, strongholda 13th-century fortress
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In the past, a citadel was a strong building in or near a city, where people could shelter for safety.
The citadel at Besançon towered above the river.
A fort is a strong building or a place with a wall or fence around it where soldiers can stay and be safe from the enemy.
Soldiers inside the fort are under sustained attack.
Video: pronunciation of 'fortress'
Thesaurus for fortress from the Collins English Thesaurus
A fortress is a castle or other large strong building, or a well-protected place, which is intended to be difficult for enemies to enter .