stern vs tail end

stern and tail end both are nouns.

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

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

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

stern (adjective)	tail end (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