(ض، ن) نَذَرَ يَنْذِرُ وَيَنْذُرُ نَذْرًاnadhara yandhiru wa-yandhuru nadhran: to make something not obligatory binding upon oneself, to make a vow. ﴿اِنِّيْ نَذَرْتُ لِلرَّحْمٰنِ صَوْمًا﴾ (Maryam 19:26)
نَذْرٌnadhr pl. نُذُوْرٌnudhūr (verbal noun, maṣdar, also a noun, ism dhāt): a vow. ﴿يُوْفُوْنَ بِالنَّذْرِ﴾ (Al-Insān 76:7); ﴿وَلْيُوْفُوْا نُذُوْرَهُمْ﴾ (Al-Ḥajj 22:29)
(س) نَذِرَ يَنْذَرُ نَذَرًاnadhira yandharu nadharan: to be warned of an expected danger. (This verb is not used in the Quran.)
نَذِيْرٌnadhīr pl. نُذُرٌnudhur (on the pattern of فَعِيْلٌfaʿīl, but meaning one who warns rather than one who is warned): a warner; نُذُرٌnudhur also occurs in the sense of warnings. ﴿اِنَّآ اَرْسَلْنٰكَ بِالْحَقِّ بَشِيْرًا وَّنَذِيْرًا﴾ (Al-Baqarah 2:119); ﴿كَذَّبَتْ ثَمُوْدُ بِالنُّذُرِ﴾ (Al-Qamar 54:23)
Form IV (ifʿāl) اَنْذَرَ يُنْذِرُ اِنْذَارًاandhara yundhiru indhāran: to warn of an expected danger, to frighten; مُنْذِرٌmundhir (active participle, ism fāʿil): a warner. ﴿وَاَنْذِرْ عَشِيْرَتَكَ الْاَقْرَبِيْنَ﴾ (Ash-Shuʿarāʾ 26:214); ﴿اِنَّمَآ اَنْتَ مُنْذِرٌ﴾ (Ar-Raʿd 13:7)