noun (n)

• something added to foods to make them taste sweeter(noun.food)

  Synonym:
  sweetener
  

  source: wordnet30
• an improvement that makes something more agreeable(noun.act)

  Synonym:
  enhancement
  

  source: wordnet30
• the act of adding a sweetener to food(noun.act)

  source: wordnet30
• The act of making sweet.(noun)

  source: webster1913