There are certain items that are generally unique to ships, or different for ships. Here's a partial profile.
Communicators (etheric, EM)
Sensors (etheric, EM)
Armour
Teleporters
Tools
Patches
Power Systems
Control Systems
Force Beams
Air Locks and Hatches
Landing Gear
Gravitic/Inertial Systems
Cargo Holds
Living Space
Think we forgot the engines? Nope, we decided to rant at length about drives here.