Citadel and Presidio

Citadel noun - A structure or place from which one can resist attack.

Presidio and citadel are semantically related In some cases you can use "Presidio" instead a noun "Citadel".

Presidio noun - A fortress established in the southwestern United States by the Spanish in order to protect their missions and other holdings.

Citadel and presidio are semantically related in refuge topic. You can use "Citadel" instead a noun "Presidio", if it concerns topics such as reinforced position.