Suboptimally is valid Scrabble Word

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

Definitions for SUBOPTIMALLY in dictionary:

Similar words containing OPTIMAL without suffix ly and without prefix sub

optimal11 optimally16 nonoptimal14 optimalise14 optimality17 optimalize23 suboptimal16 optimalised16 optimalises15 optimalized25 optimalizes24 optimalising17 optimalities16 optimalizing26 optimalisation18 optimalization27 optimalisations19 optimalizations28
Find what other words can be done using letters: "suboptimally"
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