소화물 - small cargo (package/s to be sent ahead on departure and ready for collection at destination)
수하물 - accompanied luggage (incl. small hand luggages)
수화물 - checked baggage (incl. large luggage items) to be kept in separate compartments during the trip or forwarded in advance for collection at destination.
수하물 & 수화물 rightly or wrongly, are often used interchangeably.
짐 - baggage (in the broader sense which includes luggage); cargo
수하물 - luggage (baggage, 짐 that can be carried, generally by hands). Note:
• 수 comes from hanja for "hand", to be used only in compound words.
• 하물 comes from 화물 meaning transportable goods. Again, 하물 is only found in compound words.