sexual desire vs sex

sexual desire and sex both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual desire	Yes	No	No	No
sex	Yes	No	Yes	No

sexual desire (noun)	sex (noun)
a desire for sexual intimacy	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

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