lowlife vs scum bag

lowlife and scum bag both are nouns.

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

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

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

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

lowlife (noun)	scum bag (noun)
a person who is deemed to be despicable or contemptible	a person who is deemed to be despicable or contemptible