scumbag vs bum

scumbag and bum both are nouns.

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

As nouns, scumbag and bum are synonyms defined as:

scumbag and bum: a person who is deemed to be despicable or contemptible

Other synonyms of scumbag include crumb, dirty dog, git, lowlife, puke, rat, rotter, scum bag, skunk, so-and-so, stinker, stinkpot.

scumbag (noun)	bum (noun)
a person who is deemed to be despicable or contemptible	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

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

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