outlaw vs illicit

outlaw is a noun but illicit is not a noun.

Word	Noun	Adjective	Verb	Adverb
outlaw	Yes	Yes	Yes	No
illicit	No	Yes	No	No

As adjectives, outlaw and illicit are synonyms defined as:

Other synonyms of outlaw include illegitimate, outlawed, unlawful.

outlaw (noun)	illicit (noun)
someone who has committed a crime or has been legally convicted of a crime

outlaw (adjective)	illicit (adjective)
contrary to or forbidden by law	contrary to accepted morality (especially sexual morality) or convention
disobedient to or defiant of law	contrary to or forbidden by law

outlaw (verb)	illicit (verb)
declare illegal; outlaw