sexual activity vs safe

sexual activity and safe both are nouns.

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

sexual activity (noun)	safe (noun)
activities associated with sexual intercourse	strongbox where valuables can be safely kept
	contraceptive device consisting of a sheath of thin rubber or latex that is worn over the penis during intercourse
	a ventilated or refrigerated cupboard for securing provisions from pests

sexual activity (adjective)	safe (adjective)
	free from danger or the risk of harm
	having reached a base without being put out
	financially safe
	(of an undertaking) secure from risk