A wattmeter is an instrument that measures electrical power, and it's a crucial tool for monitoring energy consumption in various applications. There are several synonyms for the word "wattmeter" used in the electrical engineering field. One of the most common synonyms is "power meter," which measures energy consumption in watts. Another synonym is "energy meter," which measures energy consumption in kilowatt-hours. A third synonym for "wattmeter" is "power analyzer," which analyzes and displays electric power data in real-time. Some other synonyms include "power quality meter," "electricity meter," and "energy monitor." All of these terms refer to the same device, which is used for measuring and monitoring electrical power in different applications.