behind vs obscenity

behind and obscenity both are nouns.

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

behind (noun)	obscenity (noun)
the fleshy part of the human body that you sit on	an obscene act
	the trait of behaving in an obscene manner
	an offensive or indecent word or phrase

behind (adjective)	obscenity (adjective)
having the lower score or lagging position in a contest

behind (adverb)	obscenity (adverb)
in or to or toward the rear
remaining in a place or condition that has been left or departed from
in debt
in or into an inferior position
showing a time that is earlier than the actual time