In uncountable|lang=en terms the difference between nonuniformity and unevenness
is that nonuniformity is (uncountable) the condition of being nonuniform while unevenness is (uncountable) the quality or characteristic of being uneven; irregularity; inconsistency; the lack of smoothness or continuity.
In countable|lang=en terms the difference between nonuniformity and unevenness
is that nonuniformity is (countable) a nonuniform thing while unevenness is (countable) the result or product of being uneven.
As nouns the difference between nonuniformity and unevenness
is that nonuniformity is (uncountable) the condition of being nonuniform while unevenness is (uncountable) the quality or characteristic of being uneven; irregularity; inconsistency; the lack of smoothness or continuity.
nonuniformity
English
Alternative forms
*non-uniformity
Noun
(uncountable) The condition of being nonuniform
(countable) A nonuniform thing
unevenness
English
Noun
(uncountable) The quality or characteristic of being uneven; irregularity; inconsistency; the lack of smoothness or continuity.
:The unevenness of his voice betrayed his nervousness.
(countable) The result or product of being uneven.
A rough or uneven thing.
*1633 , John Donne, "Sapho to Philænis":
*:His chinne, a thorny hairy unevennesse , / Doth threaten, and some daily change possesse.