sex vs X

sex and X both are nouns.

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

sex (noun)	X (noun)
activities associated with sexual intercourse	street names for methylenedioxymethamphetamine
the properties that distinguish organisms on the basis of their reproductive roles	the 24th letter of the Roman alphabet
all of the feelings resulting from the urge to gratify sexual impulses	the cardinal number that is the sum of nine and one; the base of the decimal system
either of the two categories (male or female) into which most organisms are divided

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