Riftiest is valid Scrabble Word

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

Definitions for RIFTIEST in dictionary:

Words related to RIFTIEST

rift7 rifty11
Find what other words can be done using letters: "riftiest"
https://scrabble-word.com/finder/riftiest
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