9 letters · 16 points in Scrabble
noun someone who offers opposition
originFrom Middle English adversarie, from Anglo-Norman aversaire (in Wace's Life of Saint Margaret) and Old French aversier, aversaire (French adversaire), from Latin adversārius, from adversus (“turned toward”). By surface analysis, adverse + -ary.
Etymology from Wiktionary, CC BY-SA 3.0