Yes, subsoils is a Scrabble word!
...and is worth 10 points in Scrabble, and 13 points in Words with Friends
subsoils
Noun
1. The layer of soil between the topsoil and bedrock
What Scrabble words can I make with the letters in subsoils?
7 Letter Words
5 Letter Words
4 Letter Words
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3 Letter Words
2 Letter Words