different between smouldering vs sizzling

English

smouldering

present participle of smoulder
- 1859, Alfred Tennyson, Guinevere
  Some evil chance / Will make the smouldering scandal break and blaze.

smouldering (plural smoulderings)

(sometimes figuratively) The act by which something smoulders; residual heat.
the smoulderings of the Thirty Years War

sizzling

sizzling (comparative more sizzling, superlative most sizzling)

Hot enough to make a hissing sound.
(of food in a Chinese restaurant etc) Brought to the table in the metal dish it has been cooked in, making such a sound.
Exciting and intensely emotional or sexual.

sizzling (plural sizzlings)

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