Kilojoule is a term used to measure the energy that a particular food item gives when consumed. However, there are various synonyms for kilojoule, and these are used interchangeably in different parts of the world. Some of the common synonyms for kilojoule include calorie, joule, nutrition, and dietary energy. Technically, calorie and joule are two different units of energy, but both are used to express the same concept of kilojoule. Nutrition is another term that is used to describe the energy that we get from food, while dietary energy is a more specific term that relates to the energy content of specific diets.