The difference between Vivaciousness and Vivacity
When used as nouns, vivaciousness means the state of being vivacious, whereas vivacity means the quality or state of being vivacious.
check bellow for the other definitions of Vivaciousness and Vivacity
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Vivaciousness as a noun:
the state of being vivacious; vivacity
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Vivacity as a noun:
The quality or state of being vivacious.