Root ر ا ف(r A f) has 3 unique word forms and appears 13 times in the Quran.

English gloss Mercy, Pity Compassionate

Word Translation Occurrences
لَرَءُوفٞ Full of Kindness, (is) Full of Kindness, (is) surely Full of Kindness, (is the) Most Kind, (is) Full of Kindness, (is) surely Full of Kindness, (is the) Most Kind, Full of Kindness, surely is Most Kind, surely is Most Kind 10
رَءُوفٞ (are) Full of Kindness, (he is) kind, (is) Full of Kindness, (is) Most Kind, (are) Full of Kindness, (he is) kind, (is) Full of Kindness, (is) Most Kind 8
رَءُوفُۢ (is) full of Kindness, (is) Most Kind, (is) full of Kindness, (is) Most Kind 4
رَأۡفَةٗ compassion, compassion 2
رَأۡفَةٞ pity for them, pity for them 2