1. invention, a new thing that someone creates, 2. inventor, a person who creates something new for the first time, 3. device, a small electronic object made for a special purpose, like a phone, 4. machine, a large piece of equipment with moving parts that does work, 5. tool, an object you use with your hands to do a job, like a hammer, 6. battery, a small object that stores energy so a device can work, 7. to improve, to make something better, 8. useful, helpful; good for doing something

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