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The following are general words used to refer to objects or pieces of equipment that you use to help you to do a particular kind of job:
A tool is usually a simple object that you use to make, shape, or mend something, for example a hammer, saw, spade, or spanner.
Tools that operate by electricity are called power tools.
Other things which are used to achieve something can also be referred to as tools. This is a fairly formal use.
An implement is a simple tool used for digging or cooking. Implement is a formal word.
An instrument is an object used for a scientific or medical purpose, or for measuring something.
A musical instrument is an object from which music is produced, for example a violin, a drum, or a flute.
A utensil is usually a container or small object used for cooking, such as a saucepan or a spoon. Utensil is a formal word.
A device or gadget is usually a fairly small object, often a complicated or unusual one. Some devices and gadgets are powered by electricity. Gadget is an informal word, and is often used showing disapproval.
A machine is a piece of equipment which uses electricity or some other form of power to perform a task. It can be quite large.
An appliance is usually a machine that is used in people's homes, such as a washing machine or cooker. Appliance is a formal word.