This is the 933rd most frequent Japanese word.
駐車
"Parking"
Here, '駐車' is used as a verb referring to the action of parking a car.
駐車場に車を駐車する。
I'll park the car in the parking lot.
'駐車禁止' combines '駐車' (parking) and '禁止' (prohibited), indicating areas where parking is forbidden.
駐車禁止の場所では車を停めないでください。
Please do not stop your car in areas where parking is prohibited.
In this sentence, '駐車' refers to the concept of parking spaces.