ف ع لf-ʿ-l
(ف) فَعَلَ يَفْعَلُ فِعْلًا وَفَعْلًاfaʿala yafʿalu fiʿlan wa-faʿlan: to do something, to act. It is more general than عَمِلَʿamila: in عَمَلʿamal intention and continuity are implied, whereas فِعْلfiʿl may also be unintentional and may be attributed even to inanimate things. ﴿لَا يُسْـَٔلُ عَمَّا يَفْعَلُ وَهُمْ يُسْـَٔلُوْنَ﴾ (Al-Anbiyāʾ 21:23)
فَاعِلٌfāʿil (active participle, ism fāʿil): doer; مَفْعُوْلٌmafʿūl (passive participle, ism mafʿūl): done. ﴿وَكَانَ اَمْرُ اللّٰهِ مَفْعُوْلًا﴾ (An-Nisāʾ 4:47)
فَعَّالٌfaʿʿāl (intensive form, ṣīghat al-mubālaghah, on the pattern of فَعَّالٌfaʿʿāl): one who does whatever he wills. ﴿فَعَّالٌ لِّمَا يُرِيْدُ﴾ (Al-Burūj 85:16)