obscenity vs backside

obscenity and backside both are nouns.

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

obscenity (noun)	backside (noun)
an obscene act	the fleshy part of the human body that you sit on
the trait of behaving in an obscene manner	the side of an object that is opposite its front
an offensive or indecent word or phrase