"Opponency" validity in different word game dictionaries

Dictionary Validity
Scrabble US(US/Canada/Thailand - TWL/NWL) Yes
Scrabble UK(International - SOWPODS/CSW) Yes
Words with Friends(WWF) No

"opponency" Definition

  1. OPPOSITION, ANTAGONISM
  2. [archaic] (archaic) the action of maintaining an opposing argument in or opening an academic disputation (as in trying for a degree) by proposing objections to a tenet

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