sexual activity vs kiss

sexual activity and kiss both are nouns.

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

sexual activity (noun)	kiss (noun)
activities associated with sexual intercourse	the act of caressing with the lips (or an instance thereof)
	a light glancing touch
	any of several bite-sized candies
	a cookie made of egg whites and sugar

sexual activity (verb)	kiss (verb)
	touch with the lips or press the lips (against someone's mouth or other body part) as an expression of love, greeting, etc.
	touch lightly or gently