TgJ Hos11:6 :וֻתקַטֵיל גִיבָרוֹהִי וֻתשֵיצֵי רַברְבוֹהִי מִמִלכֵי עֲצָתְהוֹן‏ : (the sword) wil kill its warriors and eliminate its nobles due to their advice's guidance
See the entire entry for raḇ, rabbā n.m. chief; teacher