sex vs private parts

sex and private parts both are nouns.

Word	Noun	Adjective	Verb	Adverb
sex	Yes	No	Yes	No
private parts	Yes	No	No	No

sex (noun)	private parts (noun)
activities associated with sexual intercourse	external sex organ
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)	private parts (verb)
tell the sex (of young chickens)
to evoke sexual feelings