different between ludicrousness vs ludicrosity

English

ludicrous +? -ness

ludicrousness (countable and uncountable, plural ludicrousnesses)

The state or quality of being ludicrous.
- 1879, John McElroy, Andersonville, ch. 51,
  The full ludicrousness of the thing dawned upon me so forcibly that I forgot all about my excitement and scare, and laughed aloud.

ludicrous +? -ity

ludicrosity (countable and uncountable, plural ludicrosities)

ludicrousness; something ludicrous
- 1930, William Faulkner, As I Lay Dying, Library of America, 1985, p.110:
  Squatting, Dewey Dell's wet dress shapes for the dead eyes of three blind men those mammalian ludicrosities which are the horizons and the valleys of the earth.

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