Rumbledethumps is valid Scrabble Word

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

Definitions for RUMBLEDETHUMPS in dictionary:

Similar words containing RUMBLEDETHUMP without suffix s

rumbledethump25
Find what other words can be done using letters: "rumbledethumps"
https://scrabble-word.com/finder/rumbledethumps
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