Yes, seiche is a Scrabble word!
...and is worth 11 points in Scrabble, and 11 points in Words with Friends
seiche
Noun
1. A wave on the surface of a lake or landlocked bay; caused by atmospheric or seismic disturbances
What Scrabble words can I make with the letters in seiche?
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words