different between lowness vs howness

English

low +? -ness

lowness (countable and uncountable, plural lownesses)

The property of being low.
- 1898, J. Meade Falkner, Moonfleet Chapter 4
  Then I was forced to rest; and, sitting down on the ground, saw that the glimmering streak of light had faded, and that the awful blackness of the previous night was creeping up again. And now I had no heart to face it, being cowed with hunger, thirst, and weariness; and so flung myself upon my face, that I might not see how dark it was, and groaned for very lowness of spirit.
(countable) Something that is low or vulgar.
lownesses of expression

From how +? -ness.

howness (uncountable)

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