"Diet Coke" is a popular soft drink brand that has been around since the 1980s. However, some people may want to use synonyms when referring to this beverage. Such substitutes could include reduced-calorie cola, light soda, calorie-free pop, and low-sugar soft drink. Other terms that could be used include sugar-free cola, diet pop, zero-calorie soda, and low-cal soda. These synonyms still get the same great taste as Diet Coke, but without the calories and sugar. It's good to know that there are many options available for those who want to enjoy a refreshing beverage without compromising their diet or health.