Dropstone is valid Scrabble Word

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

Definitions for DROPSTONE in dictionary:

Words related to DROPSTONE

dropstones13

Words that contain DROPSTONE

dropstones13
Find what other words can be done using letters: "dropstone"
https://scrabble-word.com/finder/dropstone
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