uneven vs evenness

uneven is not a noun while evenness is a noun.

Word	Noun	Adjective	Verb	Adverb
uneven	No	Yes	No	No
evenness	Yes	No	No	No

uneven (noun)	evenness (noun)
	a quality of uniformity and lack of variation
	the quality of being balanced
	the parity of even numbers (divisible by two)

uneven (adjective)	evenness (adjective)
not even or uniform as e.g. in shape or texture
not divisible by two
lacking consistency
(of a contest or contestants) not fairly matched as opponents
variable and recurring at irregular intervals