bum vs ass

bum and ass both are nouns.

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

As nouns, bum and ass are synonyms defined as:

bum (noun)	ass (noun)
the fleshy part of the human body that you sit on	slang for sexual intercourse
a vagrant	hardy and sure-footed animal smaller and with longer ears than the horse
a person who is deemed to be despicable or contemptible	the fleshy part of the human body that you sit on
person who does no work	a pompous fool

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

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