crumb vs so-and-so

crumb and so-and-so both are nouns.

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

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

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

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

crumb (noun)	so-and-so (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