Crowborough rhymes with:
attenborough, attleboro, edinboro, edinburgh, farnborough, foxboro, foxborough, gainsboro, goldsborough, hillsboro, hillsborough, marlboro, marlborough, owensboro, peterborough, pittsboro, rosborough, rossborough, triborough, waynesboro, westboro, westborough, wilkesboro, yarboro, yarbrough
Crowborough sounds like:
cara'veras, carberry's, carver's, carvers, cherbourg