Unwithering is valid Scrabble Word

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

11 letters word
18 points in Scrabble
21 points in WWF

Definitions for UNWITHERING in dictionary:

ADJECTIVE:

not withering

Similar words containing WITHER without suffix ing and without prefix un

wither12 swither13 withers13 swithers14 withered15 witherer14 witherod15 swithered16 witherers15 withering16 witherite15 witherods16 swithering17 unwithered17 witherings17 witherites16 witheringly21 withershins20 witheredness19 witherednesses21

Find what other words can be done using letters: "unwithering"
https://scrabble-word.com/finder/unwithering

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