stern vs after part

stern and after part both are nouns.

Word	Noun	Adjective	Verb	Adverb
stern	Yes	Yes	No	No
after part	Yes	No	No	No

As nouns, stern and after part are synonyms defined as:

Other synonyms of stern include poop, quarter, tail.

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

stern (adjective)	after part (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