stern vs demanding

stern is a noun but demanding is not a noun.

Word	Noun	Adjective	Verb	Adverb
stern	Yes	Yes	No	No
demanding	No	Yes	No	No

stern (noun)	demanding (noun)
the rear part of a ship
the fleshy part of the human body that you sit on

stern (adjective)	demanding (adjective)
severe and unremitting in making demands	requiring more than usually expected or thought due; especially great patience and effort and skill
not to be placated or appeased or moved by entreaty
of a stern or strict bearing or demeanor; forbidding in aspect
severely simple