(س) رَحِمَ يَرْحَمُ رَحْمَةً وَمَرْحَمَةًraḥima yarḥamu raḥmatan wa-marḥamatan: to show mercy and compassion, to be tender-hearted (it takes a direct object). ﴿اِلَّا مَنْ رَّحِمَ رَبُّكَ﴾ (Hūd 11:119); ﴿وَتَوَاصَوْا بِالْمَرْحَمَةِ﴾ (Al-Balad 90:17)
رَحْمَةٌraḥmah (also as a noun, ism dhāt): compassion, mercy. ﴿وَرَحْمَتِيْ وَسِعَتْ كُلَّ شَيْءٍ﴾ (Al-Aʿrāf 7:156)
اَرْحَمُarḥamu (elative, ism tafḍīl): more, or the most, merciful. ﴿وَاَنْتَ اَرْحَمُ الرّٰحِمِيْنَ﴾ (Al-Aʿrāf 7:151)
رَحِيْمٌraḥīm pl. رُحَمَآءُruḥamāʾu (adjective on the pattern of فَعِيْلٌfaʿīl, in the sense of an active participle, ism fāʿil): ever-merciful, constantly showing mercy. ﴿رُحَمَآءُ بَيْنَهُمْ﴾ (Al-Fatḥ 48:29)
اَلرَّحْمٰنُar-raḥmān (intensive form, ṣīghat al-mubālaghah): exceedingly merciful. ﴿بِسْمِ اللّٰهِ الرَّحْمٰنِ الرَّحِيْمِ﴾ (Al-Fātiḥah 1:1)
(ک) رَحُمَ يَرْحُمُ رَحَامَةًraḥuma yarḥumu raḥāmatan: to suffer an ailment of the womb.
رَحِمٌraḥim pl. اَرْحَامٌarḥām (noun, ism dhāt): (1) womb. ﴿هُوَ الَّذِيْ يُصَوِّرُكُمْ فِي الْاَرْحَامِ كَيْفَ يَشَآءُ﴾ (Āl ʿImrān 3:6); (2) kinship. ﴿وَاُولُوا الْاَرْحَامِ بَعْضُهُمْ اَوْلٰى بِبَعْضٍ﴾ (Al-Anfāl 8:75)