bum vs rump

bum and rump both are nouns.

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

As nouns, bum and rump are synonyms defined as:

bum (noun)	rump (noun)
the fleshy part of the human body that you sit on	the part of an animal that corresponds to the human buttocks
a vagrant	the fleshy part of the human body that you sit on
a person who is deemed to be despicable or contemptible	fleshy hindquarters; behind the loin and above the round
person who does no work

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

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