different between roughness vs sternness

English

rough +? -ness

roughness (countable and uncountable, plural roughnesses)

The property of being rough, coarseness.
The roughness of the road made me wonder if my car would fall apart.
Something that is rough; a rough spot.
- 2003, Klaus Bange, “Surfaces of Substrate Glasses”. In: Thin Films on Glass, Springer Science & Business Media, page 101:
  A variety of suitable methods for surface inspection are available to detect topographical defects induced by surface roughnesses such as scratches, digs, inclusions and spatters.
(US) Roughage; coarse fodder.
- 1855, Southern Cultivator (volume 13, page 258)
  With this latter implement, the corn stalk fodder, shucks, oats, hay and other "roughness" may be finely cut up […]
(Scotland) Abundance, especially of food.

stern +? -ness

sternness (countable and uncountable, plural sternnesses)

(uncountable) The state or quality of being stern.
- 2012, July 15. Richard Williams in Guardian Unlimited, Tour de France 2012: Carpet tacks cannot force Bradley Wiggins off track
  There was the sternness of an old-fashioned Tour patron in his rebuke to the young Frenchman Pierre Rolland, the only one to ride away from the peloton and seize the opportunity for a lone attack before being absorbed back into the bunch, where he was received with coolness.
(countable) The result or product of being stern.

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