Are these interchangeable, or is there a semantic difference between them? When should I use serenity vs. sereneness?
closed as general reference by Kris, tchrist, Bravo, Kristina Lopez, Matt Эллен Mar 8 '13 at 13:05
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There does not appear to be any academic difference judging from their dictionary definitions and I am not aware of any subtle difference between the two:
In practice, however, the usage of sereneness is practically nil compared to serenity, as evidenced by this NGram.