sweetener
nounUK /ˈswiːtənə/
US /ˈswiːtənər/
A sweetener is something you add to food or drink to make it taste sweet.
She put a sweetener in her tea instead of sugar.
OTHER MEANINGS
2. Something offered to make a deal or situation more appealing.
The free gift was a sweetener to get more people to sign up.
3. A substance used to make something less harsh or unpleasant.
A kind word can be a sweetener for bad news.
4. A person or thing that makes something more agreeable.
The bonus acted as a sweetener in the job offer.