Wiktionary
n. A food additive that replicates the sweetness of sugar but is not sugar.
Wikipedia
A sugar substitute is a food additive that provides a sweet taste like that of sugar while containing significantly less food energy. Some sugar substitutes are produced by nature, and others produced synthetically. Those that are not produced by nature are, in general, called artificial sweeteners.
Usage examples of "sugar substitute".
Eve walked to the counter, waited while the customer in front of her paid for a pack of milk powder and a minuscule box of sugar substitute.
The boy stared at her as if he had never heard of blue sugar substitute.
I thought you had it for breakfast every morning with a little skimmed milk and sugar substitute.
Her stock of food was limited to three cans of peaches, two cans of pears, two cans of pineapple rings, one box of a sugar substitute in small blue packets, two boxes of cereal, and a jar of instant coffee.