Unattending is valid Scrabble Word

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

Definitions for UNATTENDING in dictionary:

Similar words containing ATTEND without suffix ing and without prefix un

attend7 attends8 attended10 attendee9 attender9 coattend11 attendant10 attendees10 attenders10 attending11 coattends12 attendance13 attendancy16 attendants11 attendings12 attendment13 coattended14 unattended12 attendances14 attendement14 attendments14 coattending15 nonattender12 attendancies15 attendements15 nonattenders13 nonattendance16 nonattendances17
Find what other words can be done using letters: "unattending"
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