illicit vs sex

illicit is not a noun while sex is a noun.

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

illicit (noun)	sex (noun)
	activities associated with sexual intercourse
	the properties that distinguish organisms on the basis of their reproductive roles
	all of the feelings resulting from the urge to gratify sexual impulses
	either of the two categories (male or female) into which most organisms are divided

illicit (adjective)	sex (adjective)
contrary to accepted morality (especially sexual morality) or convention
contrary to or forbidden by law

illicit (verb)	sex (verb)
	tell the sex (of young chickens)
	to evoke sexual feelings