battery- a device that produces electricity to provide power for radios, cars, etc.
noun- a rechargeable battery
candle- a stick-shaped piece of wax with a wick (= piece of string) in the middle of it that produces light as it slowly burns
noun- Shall I light a candle?
compass- a device for finding direction with a needle that can move easily and that always points to magnetic north
noun- with the compass you can direct