Transposal is valid Scrabble Word

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

Definitions for TRANSPOSAL in dictionary:

Words related to TRANSPOSAL

transpose11
Find what other words can be done using letters: "transposal"
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