Sieth is valid Scrabble Word

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

Definitions for SIETH in dictionary:

Words related to SIETH

sieths9

Words that contain SIETH

sieths9
Find what other words can be done using letters: "sieth"
https://scrabble-word.com/finder/sieth
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