stern vs sex activity

stern and sex activity both are nouns.

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

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

stern (adjective)	sex activity (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