sex activity vs energize

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

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

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

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