IPA: /ˈswiːtənər/
KK: /ˈswitənər/
A substance that is used to make food or drinks taste sweet, often used as a substitute for sugar.
Many people use a sweetener in their coffee instead of sugar.
Sweetener → It is formed from "sweet" (from Old English *swete*, meaning having a pleasant taste) and "-ener" (a suffix used to indicate a person or thing that performs a specific action). The word "sweetener" refers to a substance that makes something sweet or enhances sweetness.
Think of something that makes food 'pleasant' ('sweet') and adds to it ('-ener'). A sweetener is something that enhances the sweetness of food.