sex activity vs volatile

sex activity and volatile both are nouns.

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

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

sex 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