ج و فj-w-f
— جَوْفjawf pl. أَجْوَافajwāf: the hollow interior of something, the belly. Only once in the Quran: ﴿مَا جَعَلَ اللّٰهُ لِرَجُلٍ مِّنْ قَلْبَيْنِ فِيْ جَوْفِهِۦ﴾ (Al-Aḥzāb 33:4)
أَجْوَفajwaf: hollow — hence the morphological term "hollow verb" (fiʿl ajwaf), i.e. a verb whose middle radical is a weak letter (ḥarf ʿillah).