irregular vs unlawful

irregular is a noun but unlawful is not a noun.

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

irregular (noun)	unlawful (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)	unlawful (adjective)
contrary to rule or accepted order or general practice	contrary to or prohibited by or defiant of law
(of solids) not having clear dimensions that can be measured; volume must be determined with the principle of liquid displacement	contrary to or forbidden by law
(used of the military) not belonging to or engaged in by regular army forces	having no legally established claim
deviating from normal expectations; somewhat odd, strange, or abnormal	not morally right or permissible
failing to meet a standard of manufacture due to an imperfection	not conforming to legality, moral law, or social convention
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