Outmastering is valid Scrabble Word

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

Definitions for OUTMASTERING in dictionary:

Words related to OUTMASTERING

outmaster11

Similar words containing OUTMASTER without suffix ing

outmaster11 outmasters12 outmastered14 scoutmaster15 scoutmasters16
Find what other words can be done using letters: "outmastering"
https://scrabble-word.com/finder/outmastering
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