different between circularity vs plumpness

English

circular +? -ity

circularity (countable and uncountable, plural circularities)

Douglas Harper (2001–2021) , “circularity”, in Online Etymology Dictionary
Joe Miller (24 January 2018) , “Davos jargon: A crime against the English language?”, in BBC News?^[1], BBC

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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