Underdevelopments is valid word

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

Definitions for UNDERDEVELOPMENTS in dictionary:

Similar words containing DERDEVELOPMENT without suffix s and without prefix un

underdevelopment25
Find what other words can be done using letters: "underdevelopments"
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