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

奇襲[kishuu] surprise attack
逆襲[gyakushuu] counterattack
急襲[kyuushuu] raid
空襲[kuushuu] air-raid
襲ぐ[tsugu] to succeed (someone in a business or inheritance)

襲い掛る[osoikakaru] to rush on
襲い攻める[osoisemeru] to array against
襲う[osou] to attack
襲撃[shuugeki] attack
襲爵[shuushaku] succession to the peerage