Unslipping is valid Scrabble Word

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

10 letters word
15 points in Scrabble
22 points in WWF

Definitions for UNSLIPPING in dictionary:

ADJECTIVE:

not slipping

Similar words containing SLIPP without suffix ing and without prefix un

slippy13 slipped12 slipper11 slippage13 slippers12 slippery15 slippier12 slippily15 slipping13 mislippen15 slippages14 slippered14 slippiest13 mislippens16 slipperier14 slipperily17 slippering15 slippiness14 mislippened18 overslipped19 sideslipped17 slipperiest15 slipperwort18 mislippening19 overslipping20 sideslipping18 slipperiness16 slipperworts19 slippinesses16 slipperinesses18

Find what other words can be done using letters: "unslipping"
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