ف س قf-s-q
(ن) فَسَقَ يَفْسُقُ فِسْقًا وَفُسُوْقًاfasaqa yafsuqu fisqan wa-fusūqan: the original sense is (of a fresh date) to come out of its skin (فَسَقَتِ الرُّطَبَةُ عَنْ قِشْرِهَاfasaqati ar-ruṭabat ʿan qishrihā); hence to go out of the bounds of obedience, to disobey. ﴿فَفَسَقَ عَنْ اَمْرِ رَبِّهِۦ﴾ (Al-Kahf 18:50)
فُسُوْقٌfusūq (verbal noun (maṣdar), also a noun (ism dhāt)): disobedience, transgression. ﴿فَلَا رَفَثَ وَلَا فُسُوْقَ وَلَا جِدَالَ فِي الْحَجِّ﴾ (Al-Baqarah 2:197)
فَاسِقٌfāsiq pl. فٰسِقُوْنَfāsiqūna (active participle (ism fāʿil)): disobedient, one who has left the bounds of obedience. ﴿وَاُولٰٓئِكَ هُمُ الْفٰسِقُوْنَ﴾ (An-Nūr 24:4)