device

/dəˈvaɪs/noun

A tool or piece of equipment, often mechanical or electronic, designed to do a specific job.

Example sentence

“This little device measures the humidity in the greenhouse.”

Don't confuse with 'devise': device is the noun, devise the verb. 'Left to their own devices' means left unsupervised.

Related words

applicationA piece of software that a user treats as one tool designed for a specific purpose.wirelessWorking without wires or cables.digitalConnected with computers or with the modern age of electronic information.chargerA device used to fill or refill something with electrical power.gadgetA small tool or device, often clever or unusual, especially one whose exact name you can't remember.batteryA unit made of one or more chemical cells that stores energy and supplies electricity to devices.