General:
* Device: This is a broad term that could refer to any portable object with a specific function.
* Gadget: This is similar to device, but implies something smaller and more innovative.
* Item: This is a very general term that can refer to any object.
* Tool: This suggests a portable object used for a specific purpose.
Specific:
* Laptop: A portable computer.
* Tablet: A small, touch-screen computer.
* Smartphone: A mobile phone with advanced computing capabilities.
* Camera: A device for taking pictures.
* Radio: A device for listening to broadcasts.
* Speaker: A device for playing audio.
* Charger: A device for charging batteries.
* Power Bank: A portable battery pack for charging devices.
More abstract:
* Portability: This is a noun that refers to the quality of being portable.
* Mobility: This refers to the ability to move easily.
The best choice will depend on the specific context.