backside vs sexual practice

backside and sexual practice both are nouns.

Word	Noun	Adjective	Verb	Adverb
backside	Yes	No	No	No
sexual practice	Yes	No	No	No

backside (noun)	sexual practice (noun)
the fleshy part of the human body that you sit on	activities associated with sexual intercourse
the side of an object that is opposite its front