evenness vs uneven

evenness is a noun but uneven is not a noun.

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

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

evenness (adjective)	uneven (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