Unstooping is valid Scrabble Word

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

Definitions for UNSTOOPING in dictionary:

Similar words containing STOOP without suffix ing and without prefix un

stoop7 astoop8 stoope8 stoops8 stooped10 stooper9 stoopes9 stoopers10 stooping11 stoopball13 stoopballs14 stoopingly16
Find what other words can be done using letters: "unstooping"
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