Radiator is designed for automotive engine cooling, hot water flowing inside is from the car engine which is circulating water.
Condenser is designed for summer car air conditioning, conditioning refrigerant flow in it. Car condenser and radiator is actually the same thing, that is, the same home air conditioner outdoor unit, the condenser is a written name, and the radiator is a common name, that is, when cooling it is for radiator.
The automobile condenser cools the high-pressure, high-temperature refrigerant (gaseous refrigerant) sent from the compressor. The condenser will release the heat by the refrigerant from the air passing through the evaporator. This will be accomplished by the air flow when the vehicle is moving and the air flow made by the cooling fan. It is a condensation process, so it is called condenser and condensation is also radiator process.