sexual activity vs capricious

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

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

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

sexual activity (adjective)	capricious (adjective)
	determined by chance or impulse or whim rather than by necessity or reason
	changeable