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

斃す[taosu] to throw down
斃れる[taoreru] to fall
斃死[heishi] falling dead

凶弾に斃れる[kyoudannitaoreru] to be shot to death by an assassin
敵を斃す[tekiwotaosu] to kill one's enemy (opponent)
斃仆[heifu] falling dead