sex vs sex drive

sex and sex drive both are nouns.

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

sex (noun)	sex drive (noun)
activities associated with sexual intercourse	a physiological need for sexual activity
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

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