sexual practice vs backside

sexual practice and backside both are nouns.

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

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