crumb vs scum bag

crumb and scum bag both are nouns.

Word	Noun	Adjective	Verb	Adverb
crumb	Yes	No	Yes	No
scum bag	Yes	No	No	No

As nouns, crumb and scum bag are synonyms defined as:

crumb and scum bag: a person who is deemed to be despicable or contemptible

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

crumb (noun)	scum bag (noun)
small piece of e.g. bread or cake	a person who is deemed to be despicable or contemptible
a person who is deemed to be despicable or contemptible
a very small quantity of something