sexual practice vs charge up

sexual practice is a noun but charge up is not a noun.

Word	Noun	Adjective	Verb	Adverb
sexual practice	Yes	No	No	No
charge up	No	No	Yes	No

sexual practice (noun)	charge up (noun)
activities associated with sexual intercourse

sexual practice (verb)	charge up (verb)
	cause to be agitated, excited, or roused