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

囲碁[igo] Go (board game of capturing territory)
碁石[goishi] Go pieces
碁盤[goban] Go board
碁盤の目[gobannome] intersection on a Go board
持碁[jigo] Go game resulting in tie or draw

碁会所[gokaijo] commercial go-playing parlour (parlor)
碁盤縞[gobanjima] check
詰め碁[tsumego] composed go problem
碁打ち[gouchi] go player