From the same as Horam; a castle (from its height) -- palace.
see HEBREW Horam
H2038. Harmon
[הַרְמוֺן] noun masculine meaning dubious; text perhaps corrupt; only Amos 4:3 הַהַרְמ֫וֺנָה וְהִשְׁלַכְתֶּנָֿה and ye shall cast them (your אחרית, posterity, AE; Hi RV cast [yourselves], but read rather with Vrss as passive ׳וְהָשְׁל shall be cast) into Harmon; if text be sound, some locality must be meant, though the nature of the allusion is lost (AV, into the palace, treats הרמון improbable as = ארמון). ᵑ6 ᵑ7 have mountain (s) of Armenia (מוֺנָה הַר), Symm Armenia, compare LagGes. Abh. 172, HoffmZAW iii. 1882, 102, of exile; Hi-St for ׳ה read הֲדַדְרִמּוֺנָה to Hadadrimmon, proper name, of a location in plain of Jezreel, so Gunning; ᵐ5 εἰς τὸ ὄρος τὸ Ῥομμαν, whence Ew ingeniously רמונה ההר and ye shall cast Rimmonah (name of idol, supposed feminine of Rimmon 2 Kings 5:18) to the mountains.
הָרַמִּים see אֲרַמִּי above