(ف) فَتَحَ يَفْتَحُ فَتْحًاfataḥa yaftaḥu fatḥan: (1) to open (2) to judge, to decide (3) to grant victory and success. ﴿اِنَّا فَتَحْنَا لَكَ فَتْحًا مُّبِيْنًا﴾ (Al-Fatḥ 48:1); ﴿رَبَّنَا افْتَحْ بَيْنَنَا وَبَيْنَ قَوْمِنَا بِالْحَقِّ﴾ (Al-Aʿrāf 7:89)
فَتَّاحٌfattāḥ (intensive form (ṣīghat al-mubālaghah) on the pattern of فَعَّالٌfaʿʿāl): one who judges decisively; a name of God. ﴿وَهُوَ الْفَتَّاحُ الْعَلِيْمُ﴾ (Sabaʾ 34:26)
مِفْتَحٌmiftaḥ pl. مَفَاتِحُmafātiḥu (noun of instrument (ism ālah)): a key; also a treasure. ﴿وَعِنْدَهُۥ مَفَاتِحُ الْغَيْبِ﴾ (Al-Anʿām 6:59)
Form VIII (iftiʿāl) اِفْتَتَحَ يَفْتَتِحُ اِفْتِتَاحًاiftataḥa yaftatiḥu iftitāḥan: to begin a task; to open (this verb is not used in the Quran).
Form X (istifʿāl) اِسْتَفْتَحَ يَسْتَفْتِحُ اِسْتِفْتَاحًاistaftaḥa yastaftiḥu istiftāḥan: to seek victory or a judgement. ﴿اِنْ تَسْتَفْتِحُوْا فَقَدْ جَآءَكُمُ الْفَتْحُ﴾ (Al-Anfāl 8:19)