sexual activity vs stern

sexual activity and stern both are nouns.

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

sexual activity (noun)	stern (noun)
activities associated with sexual intercourse	the rear part of a ship
	the fleshy part of the human body that you sit on

sexual activity (adjective)	stern (adjective)
	severe and unremitting in making demands
	not to be placated or appeased or moved by entreaty
	of a stern or strict bearing or demeanor; forbidding in aspect
	severely simple