dirty dog vs scumbag

dirty dog and scumbag both are nouns.

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

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

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

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

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