Grouping rhymes with:
regrouping, drooping, regrouping, trooping, drooping, looping, recouping, regrouping, scooping, shuping, snooping, stooping, swooping, trooping, whooping
Grouping sounds like:
girobank, grabbing, grabens, grabinski, grapevines, gribbins, grievance, grievances, grieving, griffin's, griffing, griping, gripping, groping, groupings, gryphons