unlawful vs irregular

unlawful is not a noun while irregular is a noun.

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

unlawful (noun)	irregular (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

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