ن د وn-d-w
(ن) نَدَا يَنْدُوْ نَدْوًاnadā yandū nadwan (original form: نَدَوَ يَنْدُوُnadawa yanduwu): to gather in an assembly; to gather (people) into an assembly. (This verb is not used in the Quran.)
نَادٍnād (اصلاً نَادِوٌaṣlan nādiw ← نَادِيٌnādiy, active participle, ism fāʿil): an assembly; also the people of the assembly. ﴿فَلْيَدْعُ نَادِيَهُۥ﴾ (Al-ʿAlaq 96:17); ﴿وَتَاْتُوْنَ فِيْ نَادِيْكُمُ الْمُنْكَرَ﴾ (Al-ʿAnkabūt 29:29)
نَدِيٌّnadiyy (on the pattern of فَعِيْلٌfaʿīl): an assembly, a gathering. Only once in the Quran: ﴿اَيُّ الْفَرِيْقَيْنِ خَيْرٌ مَّقَامًا وَّاَحْسَنُ نَدِيًّا﴾ (Maryam 19:73)