do-nothing vs bum

do-nothing and bum both are nouns.

Word	Noun	Adjective	Verb	Adverb
do-nothing	Yes	Yes	No	No
bum	Yes	Yes	Yes	No

As nouns, do-nothing and bum are synonyms defined as:

Other synonyms of do-nothing include idler, layabout, loafer.

do-nothing (noun)	bum (noun)
person who does no work	the fleshy part of the human body that you sit on
	a vagrant
	a person who is deemed to be despicable or contemptible
	person who does no work

do-nothing (adjective)	bum (adjective)
characterized by inability or unwillingness to work toward a goal or assume responsibility	of very poor quality; flimsy

do-nothing (verb)	bum (verb)
	ask for and get free; be a parasite
	be lazy or idle