A calculator is a mobile computing device or tool that helps you to perform basic to advanced calculations. However, there are various synonyms that you can use instead of the word "calculator." Some of them include abacus, adding machine, arithmetic device, computation tool, digital computer, computing machine, or electronic calculator, depending on the type of calculator and the level of computing power you require. There are also specialized terms such as scientific calculator, financial calculator, or graphing calculator, all of which have specific functions and are used for different purposes. Whatever synonym you prefer, a calculator is an essential tool for anyone needing to perform calculations in daily life or in a professional environment.