fundament vs stern

fundament and stern both are nouns.

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

As nouns, fundament and stern are synonyms defined as:

fundament (noun)	stern (noun)
lowest support of a structure	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
the fundamental assumptions from which something is begun or developed or calculated or explained

fundament (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