Returf is valid Scrabble Word

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

Definitions for RETURF in dictionary:

Words related to RETURF

resod6 returfed12 returfing13 returfs10

Words that contain RETURF

returfs10 returfed12 returfing13
Find what other words can be done using letters: "returf"
https://scrabble-word.com/finder/returf
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