Efficiencies rhymes with:
deficiencies, inefficiencies, deficiencies, inefficiencies, deficiencies, inefficiencies, deficiencies, inefficiencies, agencies, agencies', agency's, conservancy's, constituencies, contingencies, counterinsurgencies, currencies, currency's, deficiencies, delinquencies, dependencies, discrepancies, emergencies, exigencies, expectancies, frequencies, inefficiencies, insolvencies, insurgencies, malignancies, pregnancies, presidencies, presidency's, redundancies, regency's, tendencies, transparencies, vacancies
Efficiencies sounds like:
effacing, efficiency, evasions, evoking