A machine, or tool
A device to make work easier is a machine, such as a lever.
It is called a machine.
A device that makes energy easier to use could be a power converter or energy transformer that changes the form of energy (such as from mechanical to electrical) for more efficient use.
A tool.
A simple machine is any device that makes work easier by decreasing the force required to move an object. Common examples of simple machines include levers, pulleys, inclined planes, and gears. These machines serve to reduce the effort needed to perform tasks like lifting, pushing, or pulling objects.
tool, lever, machine
machine
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A lever is a simple machine that makes work easier by allowing you to lift or move objects with less force.
it makes you're work easier by making things move by quicker
it makes work easier by changing an input force into a larger output force.