(ض) هَلَكَ يَهْلِكُ هَلَاكًاhalaka yahliku halākan: to be destroyed, to perish, to die. ﴿لِّيَهْلِكَ مَنْ هَلَكَ عَنْۢ بَيِّنَةٍ وَّيَحْيٰى مَنْ حَيَّ عَنْۢ بَيِّنَةٍ﴾ (Al-Anfāl 8:42)
هَالِكٌhālik (active participle, ism fāʿil): one who perishes, one who passes away. ﴿كُلُّ شَيْءٍ هَالِكٌ اِلَّا وَجْهَهُۥ﴾ (Al-Qaṣaṣ 28:88)
تَهْلُكَةٌtahlukah (noun, ism dhāt): destruction, ruin. Only once in the Quran: ﴿وَلَا تُلْقُوْا بِاَيْدِيْكُمْ اِلَي التَّهْلُكَةِ﴾ (Al-Baqarah 2:195)
مَهْلِكٌmahlik (noun of time or place, ẓarf / mīmī verbal noun, maṣdar mīmī, on the pattern of مَفْعِلٌmafʿil): the time or place of destruction; destruction. ﴿مَا شَهِدْنَا مَهْلِكَ اَهْلِهِۦ﴾ (An-Naml 27:49)
Form IV (ifʿāl) اَهْلَكَ يُهْلِكُ اِهْلَاكًاahlaka yuhliku ihlākan: to destroy, to cause to perish; مُهْلِكٌmuhlik (active participle, ism fāʿil): destroyer. ﴿وَكَمْ اَهْلَكْنَا قَبْلَهُمْ مِّنْ قَرْنٍ﴾ (Maryam 19:74); ﴿وَمَا كُنَّا مُهْلِكِي الْقُرٰٓى اِلَّا وَاَهْلُهَا ظٰلِمُوْنَ﴾ (Al-Qaṣaṣ 28:59)