Yes, libeler is a Scrabble word!
...and is worth 9 points in Scrabble, and 12 points in Words with Friends
libeler
Noun
1. One who attacks the reputation of another by slander or libel
What Scrabble words can I make with the letters in libeler?
6 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words