Synonyms of fortress

1 Syllable
fort, château
2 Syllables
barrier, rampart, towers, outwork, castle, bastion, bastions, tower, donjon, redoubt, stronghold, bulwark, fasthold
3 Syllables
citadel, bastille, minaret, garrison, garrisons, refuge, defense, citadels, safehold, presidio
4 Syllables
acropolis
5 Syllables
fortification, fortifications