恩を仇で返す[onwoadadekaesu] to return evil for good
仇敵[kyuuteki] bitter enemy
仇討[adauchi] vengeance
仇同士[katakidoushi] mutual enemies

仇讎[kyuushuu] revenge
商売仇[shoubaigataki] business rival
復仇[fukkyuu] reprisal
仇名[adana] nickname

敵わない[kanawanai] no match for
怨敵[onteki] sworn enemy
外敵[gaiteki] foreign enemy
敵う[kanau] to come true (wish)
仇敵[kyuuteki] bitter enemy

敵討[katakiuchi] vengeance
敵同士[tekidoushi] mutual enemies
旧敵[kyuuteki] old enemy
強敵[kyouteki] formidable enemy
公敵[kouteki] public enemy