(ن) رَبَّ يَرُبُّ رَبًّاrabba yarubbu rabban: to develop something stage by stage and bring it to its perfection, to nurture, to rear, to be master of.
رَبٌّrabb pl. اَرْبَابٌarbāb: nurturer, master (active participle, ism fāʿil, with the alif dropped). ﴿اَلْحَمْدُ لِلّٰهِ رَبِّ الْعٰلَمِيْنَ﴾ (Al-Fātiḥah 1:2); ﴿ءَاَرْبَابٌ مُّتَفَرِّقُوْنَ خَيْرٌ اَمِ اللّٰهُ الْوَاحِدُ الْقَهَّارُ﴾ (Yūsuf 12:39)
رَبَّانِيٌّrabbāniyy pl. رَبّٰنِيُّوْنَrabbāniyyūna: devoted to the Lord, men of God. ﴿وَلٰكِنْ كُوْنُوْا رَبّٰنِيِّۦنَ﴾ (Āl ʿImrān 3:79)
رِبِّيٌّribbiyy pl. رِبِّيُّوْنَribbiyyūna: people devoted to the Lord, men of God. ﴿وَكَاَيِّنْ مِّنْ نَّبِيٍّ قٰتَلَ مَعَهُۥ رِبِّيُّوْنَ كَثِيْرٌ﴾ (Āl ʿImrān 3:146)
رَبِيْبَةٌrabībah pl. رَبَآئِبُrabāʾibu: a stepdaughter under one's care. ﴿وَرَبَآئِبُكُمُ الّٰتِيْ فِيْ حُجُوْرِكُمْ﴾ (An-Nisāʾ 4:23)