Unbiassing is valid Scrabble Word

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

Definitions for UNBIASSING in dictionary:

Words related to UNBIASSING

unbias8 unbiassings14
Find what other words can be done using letters: "unbiassing"
https://scrabble-word.com/finder/unbiassing
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