1 Kings 16:18אַרְמוֹן
When Zimri saw that the city was captured, he entered the citadel of the royal palace and burned it down upon himself. So he died
Psalm 48:3בְּאַרְמְנוֹתֶיהָ
God is in her citadels; He has shown Himself to be a fortress.
Isaiah 23:13אַרְמְנוֹתֶיהָ
Look at the land of the Chaldeans—a people now of no account. The Assyrians destined it for the desert creatures; they set up their siege towers and stripped its palaces. They brought it to ruin.
Jeremiah 6:5אַרְמְנוֹתֶיהָ ס
Rise up, let us attack by night and destroy her fortresses!’”
Lamentations 2:5אַרְמְנוֹתֶיהָ
The Lord is like an enemy; He has swallowed up Israel. He has swallowed up all her palaces and destroyed her strongholds. He has multiplied mourning and lamentation for the Daughter of Judah.
Amos 1:4אַרְמְנוֹת
So I will send fire upon the house of Hazael to consume the citadels of Ben-hadad.

Brown-Driver-Briggs

אַרְמוֹן n.m. citadel—citadel, castle, palace, not used before royal period, mostly in prophets, esp. common in Am & Je

Sources: Brown-Driver-Briggs (1906, public domain) from the Open Scriptures Hebrew Lexicon (CC BY 4.0), glosses from STEPBible TBESH (CC BY 4.0); STEPBible TAHOT (Hebrew Bible, Leningrad Codex, CC BY 4.0); the Berean Standard Bible (public domain). Reformatted by Word Study, wording unchanged. All sources and licenses.