Words

Hebrew
rḥm - (qal, pi.) to love, to meet someone with love, to take pity on someone (HALOT 1216)
Hebrew
raḥămīm - a feeling of love, loving sensation, mercy (HALOT 1218)
Hebrew
rḥṣ - to wash, to bathe, to rinse off (HALOT 1220)
Hebrew
raḥat - winnowing shovel (HALOT 1222)

Note a meaning shift < *raḥt-, with shortening of *ā in a closed syllable, a process common in Hbr. 

Hebrew
rēḥayim - (du.) millstone (BDB 932; HALOT 1216)
Hebrew
rkk - to be soft (HALOT 1236)
Hebrew
rōḳ - spittle (HALOT 1287)
Hebrew
rḳḥ - to prepare, mix spiced ointment (HALOT 1289, Kogan 2015:422)
Hebrew
rḳḳ - to spit (HALOT 1292)
Hebrew
raḳḳā - thinness (HALOT 1288)