sexual activity vs energize

sexual activity is a noun but energize is not a noun.

Word	Noun	Adjective	Verb	Adverb
sexual activity	Yes	No	No	No
energize	No	No	Yes	No

sexual activity (noun)	energize (noun)
activities associated with sexual intercourse

sexual activity (verb)	energize (verb)
	cause to be alert and energetic
	raise to a higher energy level