sexual practice vs behind

sexual practice and behind both are nouns.

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

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

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

sexual practice (adverb)	behind (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