خ و ضkh-w-ḍ
(ن) خَاضَ يَخُوْضُ خَوْضًاkhāḍa yakhūḍu khawḍan: (1) to wade into deep water (2) to split hairs, to plunge into idle discussion. ﴿وَخُضْتُمْ كَالَّذِيْ خَاضُوْا﴾ (At-Tawbah 9:69)
خَوْضٌkhawḍ: idle discussion. ﴿ثُمَّ ذَرْهُمْ فِيْ خَوْضِهِمْ يَلْعَبُوْنَ﴾ (Al-Anʿām 6:91)
خَآئِضٌkhāʾiḍ (active participle, ism fāʿil): one who plunges into discussion. ﴿وَكُنَّا نَخُوْضُ مَعَ الْخَآئِضِيْنَ﴾ (Al-Muddaththir 74:45)