crumb vs dirty dog

crumb and dirty dog both are nouns.

Word	Noun	Adjective	Verb	Adverb
crumb	Yes	No	Yes	No
dirty dog	Yes	No	No	No

As nouns, crumb and dirty dog are synonyms defined as:

crumb and dirty dog: a person who is deemed to be despicable or contemptible

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

crumb (noun)	dirty dog (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