bum vs stern

bum and stern both are nouns.

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

As nouns, bum and stern are synonyms defined as:

bum (noun)	stern (noun)
the fleshy part of the human body that you sit on	the rear part of a ship
a vagrant	the fleshy part of the human body that you sit on
a person who is deemed to be despicable or contemptible
person who does no work

bum (adjective)	stern (adjective)
of very poor quality; flimsy	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

bum (verb)	stern (verb)
ask for and get free; be a parasite
be lazy or idle