Claystone is valid Scrabble Word

Is claystone a scrabble word?
Official Scrabble Players Dictionary NO
Official Tournament and Club Word List YES
Collins Scrabble Words YES
Is claystone valid Words with Friends?
Words with Friends NO

Definitions for CLAYSTONE in dictionary:

Words related to CLAYSTONE

claystones15

Words that contain CLAYSTONE

claystones15
Find what other words can be done using letters: "claystone"
https://scrabble-word.com/finder/claystone
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