Counterarguments is valid word

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

Definitions for COUNTERARGUMENTS in dictionary:

Similar words containing UNTERARGUMENT without suffix s and without prefix co

counterargument20
Find what other words can be done using letters: "counterarguments"
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