sexual activity vs volatile

sexual activity and volatile both are nouns.

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

sexual activity (noun)	volatile (noun)
activities associated with sexual intercourse	a volatile substance; a substance that changes readily from solid or liquid to a vapor

sexual activity (adjective)	volatile (adjective)
	evaporating readily at normal temperatures and pressures
	tending to vary often or widely
	marked by erratic changeableness in affections or attachments
	liable to lead to sudden change or violence