Flatbacks is valid Scrabble Word

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

Definitions for FLATBACKS in dictionary:

Words related to FLATBACKS

flatback19

Similar words containing FLATBACK without suffix s

flatback19
Find what other words can be done using letters: "flatbacks"
https://scrabble-word.com/finder/flatbacks
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