Intelligence quotient, commonly known as IQ, is a measure of an individual's cognitive abilities. However, there are several other terms that are used as synonyms for IQ. These include mental ability, cognitive capacity, intellectual potential, brainpower, and intellectual quotient. All of these terms describe an individual's capacity to understand, reason, and learn effectively. While IQ tests have been popular in the past, recent studies have shown that other forms of intelligence, such as emotional intelligence and social intelligence, are just as important in determining a person's success in life. Therefore, it's crucial to recognize that IQ is only one aspect of intelligence, and multiple factors contribute to overall intelligence and success.