天敵 Natural Enemy

天敵
ten teki
natural enemy

天 ten heaven, nature
敵 teki enemy, opponent

天の川 ama no gawa - the Milky Way [note the pronunciation is ama] [I]
天下一 ten ka ichi - best thing on earth [I]
天国 ten goku - heaven [B]
強敵 kyou teki - strong enemy [I]