tuo2 = tu + o2

28 characters are pronounced "tuo2":

陀 驼 驮 鸵 沱 橐 佗 砣 跎 鼍 坨 酡 柁 駄 駝 駞 驒 䭾 阤 紽 槖 鮀 鴕 媠 鼉 詑 陁 馱

Take me back to 陀