客车
kè chē · HSK 6
bus
🚌 guest + vehicle = a vehicle for guests, i.e. passenger transport
客 (kè) means guest or passenger, 车 (chē) means vehicle. Put them together and you get a vehicle designed for passengers — a bus, coach, or passenger train.
车 — pictograph of a chariot/cart
车 is a pictograph originally drawn as a top-down view of a chariot, showing the axle, wheels, and carriage box. The ancient form 車 clearly depicted two wheels connected by an axle. It still means vehicle, cart, or car today.