Tumpiest is valid Scrabble Word

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

Definitions for TUMPIEST in dictionary:

Words related to TUMPIEST

tump8 tumpy12
Find what other words can be done using letters: "tumpiest"
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