stern vs tush

stern and tush both are nouns.

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

As nouns, stern and tush are synonyms defined as:

stern (noun)	tush (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

stern (adjective)	tush (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