Computer
Part of speech: noun
Definition: A programmable device that performs mathematical calculations and logical operations, especially one that can process, store and retrieve large amounts of data very quickly. A person employed to perform computations.
Example sentence: Computer science is no more about computers than astronomy is about telescopes.
Calculator
Part of speech: noun
Definition: A person who performs mathematical calculationA person who calculates (in the sense of scheming).A mechanical or electronic device that performs mathematical calculations.A set of mathematical tables.