출발(chul-bal, chulbal)
Starting to move or begin a journey from a place
When to use
Trip start, Bus departure, Train departure, Airplane takeoff
The nuance
출발 indicates the start of movement, used when a person or vehicle begins moving from a stationary state. It applies only when beginning to move forward.
정차(jeong-cha, jeongcha)
A vehicle temporarily stopping, mainly used in traffic contexts
When to use
Bus stop, Taxi stop, Traffic light stop, Passenger boarding
The nuance
정차 is used when a vehicle temporarily stops, unlike 출발 which is starting to move. It fits situations like traffic lights, passenger boarding, or traffic control.