(ن) جَنَّ يَجُنُّ جَنًّا وَجُنُوْنًاjanna yajunnu jannan wa-junūnan: to cover something and conceal it; to drive mad. ﴿فَلَمَّا جَنَّ عَلَيْهِ الَّيْلُ﴾ (Al-Anʿām 6:76)
جِنَّةٌjinnah (noun, ism dhāt): madness; also the company of the jinn. ﴿مِنَ الْجِنَّةِ وَالنَّاسِ﴾ (An-Nās 114:6)
جَآنٌّjānn: originally it is جَانِنٌjānin on the pattern fāʿil, but it is mostly used as a collective noun for the jinn and for a snake. ﴿وَالْجَآنَّ خَلَقْنٰهُ مِنْ قَبْلُ مِنْ نَّارِ السَّمُوْمِ﴾ (Al-Ḥijr 15:27); ﴿تَهْتَزُّ كَاَنَّهَا جَآنٌّ﴾ (An-Naml 27:10)
مَجْنُوْنٌmajnūn (passive participle, ism mafʿūl): mad. ﴿وَمَا صَاحِبُكُمْ بِمَجْنُوْنٍ﴾ (At-Takwīr 81:22)
جُنَّةٌjunnah: shield. ﴿اِتَّخَذُوْٓا اَيْمَانَهُمْ جُنَّةً﴾ (Al-Mujādilah 58:16)
جَنِيْنٌjanīn pl. اَجِنَّةٌajinnah: the child in the womb. ﴿وَاِذْ اَنْتُمْ اَجِنَّةٌ فِيْ بُطُوْنِ اُمَّهٰتِكُمْ﴾ (An-Najm 53:32)
جَنَّةٌjannah pl. جَنّٰتٌjannāt: a dense garden whose ground is covered by trees; paradise. ﴿جَنّٰتٍ تَجْرِيْ مِنْ تَحْتِهَا الْاَنْهٰرُ﴾ (Al-Baqarah 2:25)