sexual practice vs promiscuous

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

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

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

sexual practice (adjective)	promiscuous (adjective)
	not selective of a single class or person
	casual and unrestrained in sexual behavior