Antinationalists is valid word

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

16 letters word
16 points in Scrabble
20 points in WWF

Definitions for ANTINATIONALISTS in dictionary:

NOUN:

a person devoted to nationalism.
a member of a political group advocating or fighting for national independence, a strong national government, etc.

ADJECTIVE:

of, relating to, or promoting nationalism: the beginnings of a nationalist movement.
of, relating to, or noting a political group advocating or fighting for national independence, a strong national government, etc.

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