How to say "unity, solitude" in Arabic

Apply the app's regular shift of initial י↔و (as in ילד/وَلَدَ, "to give birth") and Arabic's root for "one, alone," و-ح-د, lines up with Hebrew יחיד ("only, singular") and יחד ("together"). Hebrew's own word for unity, אחדות, looks tempting but is built on a different, only-related root, א-ח-ד ("one") — easy to mix up. And وحدة carries both sides of the same coin, "unity" and plain "loneliness," much like יחיד can mean both "unique" and "alone."