different between sourness vs sweetness

English

From Middle English sowrenesse, sournesse, from Old English s?rnes (“sourness”), equivalent to sour +? -ness.

sourness (countable and uncountable, plural sournesses)

From Middle English swetnes, swetnesse, from Old English sw?tnes (“sweetness”), equivalent to sweet +? -ness.

sweetness (countable and uncountable, plural sweetnesses)

The condition of being sweet or sugary.
A pleasant disposition; kindness.
Ruth's overwhelming sweetness made Robert forget about his hopelessly low school grades.
(informal) Term of address for one's sweetheart.
- 1986, The Smiths (band), Bigmouth Strikes Again (song)
  Sweetness, sweetness, I was only joking when I said
  I'd like to smash every tooth in your head.
- 2011, Kimberly Gibney, Over the Edge (page 66)
  "Hey sweetness," he said. "How was practice?"

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