Yes, silt is a Scrabble word!
...and is worth 4 points in Scrabble, and 5 points in Words with Friends
silt
Verb
1. Become chocked with silt
Noun
1. Mud or clay or small rocks deposited by a river or lake
What Scrabble words can I make with the letters in silt?
4 Letter Words
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3 Letter Words
2 Letter Words