citadel

English Thesaurus

1. a stronghold into which people could go for shelter during a battle (noun.artifact)

hypernym	:	fastness, stronghold,
definition	:	a strongly fortified defensive structure (noun.artifact)

hyponym	:	acropolis,
definition	:	the citadel in ancient Greek towns (noun.artifact)

hyponym	:	kremlin,
definition	:	citadel of a Russian town (noun.artifact)

instance hyponym	:	kremlin,
definition	:	citadel of Moscow, housing the offices of the Russian government (noun.artifact)