different between roundness vs plumpness

English

From Middle English roundnesse, equivalent to round +? -ness.

roundness (usually uncountable, plural roundnesses)

plump +? -ness

plumpness (usually uncountable, plural plumpnesses)

The quality or state of being plump.
- 1913 Eleanor Porter: Pollyanna: Chapter 8:
  For five minutes Pollyanna worked swiftly, deftly, combing a refractory curl into fluffiness, perking up a drooping ruffle at the neck, or shaking a pillow into plumpness so that the head might have a better pose. Meanwhile the sick woman, frowning prodigiously, and openly scoffing at the whole procedure, was, in spite of herself, beginning to tingle with a feeling perilously near to excitement.

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