sexual activity vs self-gratification

sexual activity and self-gratification both are nouns.

Word	Noun	Adjective	Verb	Adverb
sexual activity	Yes	No	No	No
self-gratification	Yes	No	No	No

sexual activity (noun)	self-gratification (noun)
activities associated with sexual intercourse	the act of satisfying your own desires and giving yourself pleasure
	indiscipline with regard to sensuous pleasures