fortress

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a fortified defensive structure (Freq. 3)
• Syn:
fort
• Derivationally related forms:
fort (for: fort), fortify (for: fort)
• Hypernyms:
defensive structure, defense, defence
• Hyponyms:
alcazar, martello tower, presidio, sconce
• Instance Hyponyms:
Alhambra, Bastille, Tower of London, Machu Picchu
• Part Meronyms:
battlement, crenelation, crenellation