“Citadel” in Japanese
Short answer
Citadel in Japanese is “城郭” (joukaku). Full meaning: castle, citadel, fortress; castle walls, enclosure.
Other ways to say “Citadel” in Japanese
根城
nejiro stronghold, citadel, headquarters
城塞
jousai fortress, stronghold, citadel
城廓
joukaku castle, citadel, fortress; castle walls, enclosure
城砦
jousai fortress, stronghold, citadel
城さい
jousai fortress, stronghold, citadel
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