arch-enemy /ärch-enˈə-mi/

1. A chief enemy
2. Satan (also arch-felˈon, arch-fiendˈ, arch-foeˈ)

• theave
• theaves
• the ayes have it
• the back of beyond
• the Backs
• Thebaic
• Thebaid
• thebaine
• thebaines
• the balks
• the ball at one's feet
• the ball's in your court
• Theban
• the bane of one's life
• Theban year
• the Bard
• the Bay State
• thebe
• the Beast
• the beast with two backs
• the beautiful people
• the bee's knees
• the belief
• the bends
• Thebes