Tysties is valid Scrabble Word

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

Definitions for TYSTIES in dictionary:

Words related to TYSTIES

tystie9

Similar words containing TYSTIE without suffix s

tystie9
Find what other words can be done using letters: "tysties"
https://scrabble-word.com/finder/tysties
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