Slitherier is valid Scrabble Word

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

Definitions for SLITHERIER in dictionary:

Words related to SLITHERIER

slithery14

Similar words containing SLITHERI without suffix er

slithering14 slitheriest14
Find what other words can be done using letters: "slitherier"
https://scrabble-word.com/finder/slitherier
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