tail end vs stern

tail end and stern both are nouns.

Word	Noun	Adjective	Verb	Adverb
tail end	Yes	No	No	No
stern	Yes	Yes	No	No

As nouns, tail end and stern are synonyms defined as:

tail end (noun)	stern (noun)
the fleshy part of the human body that you sit on	the rear part of a ship
any projection that resembles the tail of an animal	the fleshy part of the human body that you sit on
the time of the last part of something

tail end (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