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

梟する[kyousuru] to expose (a severed head)
梟悪[kyouaku] great treachery
梟罪[kyouzai] crime of exposing a severed head
梟首[kyoushu] exposure of a severed head
梟将[kyoushou] brave general

梟敵[kyouteki] treacherous enemy
梟雄[kyouyuu] ringleader
梟猛[kyoumou] fierce
樺太梟[karafutofukurou] great grey owl (Strix nebulosa)