sexual practice vs obscene

sexual practice is a noun but obscene is not a noun.

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

sexual practice (noun)	obscene (noun)
activities associated with sexual intercourse

sexual practice (adjective)	obscene (adjective)
	suggestive of or tending to moral looseness
	designed to incite to indecency or lust
	offensive to the mind