Synonyms of 'fortress'
castleDictionary, fort, stronghold
a 13th-century fortress
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A castle is a large building with thick, high walls. Castles were built by important people, such as kings, in former times, especially for protection during wars and battles.
They were given a guided tour of the medieval castle.
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.
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 .