sex vs backside

sex and backside both are nouns.

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

sex (noun)	backside (noun)
activities associated with sexual intercourse	the fleshy part of the human body that you sit on
the properties that distinguish organisms on the basis of their reproductive roles	the side of an object that is opposite its front
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)	backside (verb)
tell the sex (of young chickens)
to evoke sexual feelings