irregular vs uneven

irregular is a noun but uneven is not a noun.

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

irregular (noun)	uneven (noun)
merchandise that has imperfections; usually sold at a reduced price without the brand name
a member of an irregular armed force that fights a stronger force by sabotage and harassment

irregular (adjective)	uneven (adjective)
contrary to rule or accepted order or general practice	not even or uniform as e.g. in shape or texture
(of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement	not divisible by two
(used of the military) not belonging to or engaged in by regular army forces	lacking consistency
deviating from normal expectations; somewhat odd, strange, or abnormal	(of a contest or contestants) not fairly matched as opponents
failing to meet a standard of manufacture due to an imperfection	variable and recurring at irregular intervals
lacking continuity or regularity
not occurring at a regular rate or fixed intervals
independent in behavior or thought
(of a surface or shape); not level or flat or symmetrical