different between pithiness vs ephemerality

English

pithy +? -ness

pithiness (usually uncountable, plural pithinesses)

ephemeral +? -ity

ephemerality (countable and uncountable, plural ephemeralities)

(uncountable) The state or condition of being ephemeral; transience.
(countable) Something that is ephemeral.
- 1961, Lewis Mumford, The City in History, Harcourt, Brace & World, p. 242:
  So, too, the multiplication of bathrooms and the over-expenditure on broadly paved motor roads, and above all, the massive collective concentration on glib ephemeralities of all kinds, performed with supreme technical audacity.

(state or condition of being ephemeral): ephemeralness, evanescence, impermanence, transience, transiency, volatility; see also Thesaurus:transience

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