lowlife vs scumbag

lowlife and scumbag both are nouns.

Word	Noun	Adjective	Verb	Adverb
lowlife	Yes	No	No	No
scumbag	Yes	No	No	No

As nouns, lowlife and scumbag are synonyms defined as:

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

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

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