Upthundering is valid Scrabble Word

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

Definitions for UPTHUNDERING in dictionary:

Words related to UPTHUNDERING

upthunder15

Similar words containing UPTHUNDER without suffix ing

upthunder15 upthunders16 upthundered18
Find what other words can be done using letters: "upthundering"
https://scrabble-word.com/finder/upthundering
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