Unflustered is valid Scrabble Word

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

11 letters word
15 points in Scrabble
19 points in WWF

Definitions for UNFLUSTERED in dictionary:

ADJECTIVE:

not flustered
not agitated; calm and self-controlled
free from emotional agitation or nervous tension

Similar words containing FLUSTER without suffix ed and without prefix un

fluster10 flusters11 flustery14 flustered13 flustering14 flusterier13 flusteredly18 flusterment16 flusteriest14 flusterments17

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

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