uneven vs invariability

uneven is not a noun while invariability is a noun.

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

uneven (noun)	invariability (noun)
	the quality of being resistant to variation
	a quality of uniformity and lack of variation

uneven (adjective)	invariability (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