Yes, esker is a Scrabble word!
...and is worth 9 points in Scrabble, and 9 points in Words with Friends
esker
Noun
1. (geology) a long winding ridge of post glacial gravel and other sediment; deposited by meltwater from glaciers or ice sheets
What Scrabble words can I make with the letters in esker?
5 Letter Words
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3 Letter Words
2 Letter Words