behind vs sexual practice

behind and sexual practice both are nouns.

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

behind (noun)	sexual practice (noun)
the fleshy part of the human body that you sit on	activities associated with sexual intercourse

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

behind (adverb)	sexual practice (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