Disgruntlement rhymes with:
dismantlement, battlement, dismantlement, entitlement, resettlement, settlement, annulment, battlement, dismantlement, embezzlement, encirclement, entanglement, entitlement, puzzlement, resettlement, settlement
dismantlement, battlement, dismantlement, entitlement, resettlement, settlement, annulment, battlement, dismantlement, embezzlement, encirclement, entanglement, entitlement, puzzlement, resettlement, settlement