rental car; hire car
Refers to the vehicle itself that is rented for a short period.
旅行のためにレンタカーを借りた。
I rented a car for the trip.
car rental agency; rent-a-car office
Refers to the business or shop that rents out cars.
駅の近くにレンタカーがある。
There is a car rental agency near the station.
I rented a car for the trip.
I returned the rental car at the airport.
We went to the tourist spot by rental car.