scumbag vs so-and-so

scumbag and so-and-so both are nouns.

Word	Noun	Adjective	Verb	Adverb
scumbag	Yes	No	No	No
so-and-so	Yes	No	No	No

As nouns, scumbag and so-and-so are synonyms defined as:

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

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

scumbag (noun)	so-and-so (noun)
a person who is deemed to be despicable or contemptible	a person who is deemed to be despicable or contemptible