天敵、宿敵を英語でなんと言うか？

宿敵、天敵はarch enemy, arch nemesis, natural enemyと言えます。0:20 his 4th rematch against arch nemesis Juan Manuel Marquez. パキアオの宿敵マルケスとの四度目の試合。

http://www.youtube.com/watch?v=H9kPrq9QMls 0:06 The duo is back, fighting alongside their superhero friend and arch nemesis in their first 4-player adventure!
http://www.youtube.com/watch?v=l3J2EIWGS2o 1;25 his arch enemy is Nicolas Sarkozy ドミニク・ド・ビルパン氏の宿敵はサルコジ氏だ。
http://www.youtube.com/watch?v=0VrTfpMAfqw 0;44 what about his arch nemesis and rival Bill Gates? ジョブズ氏の宿敵でありライバルでもあるゲイツ氏の役は誰になるんでしょうか？
http://www.youtube.com/watch?v=-ms2vE_Joq8 12:33 lions and hyenas are sort of mortal enemies.
https://www.youtube.com/watch?v=up1egVjlYsk  2:14 a group of natural enemies