Yes, scum is a Scrabble word!
...and is worth 8 points in Scrabble, and 11 points in Words with Friends
scum
Verb
1. Remove the scum from
Noun
1. Worthless people
2. A film of impurities or vegetation that can form on the surface of a liquid
What Scrabble words can I make with the letters in scum?
3 Letter Words
2 Letter Words