arch-enemy /ärch-enˈə-mi/

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

• right-fields
• right-footed
• rightful
• rightfully
• rightfulness
• rightfulnesses
• right-hand
• right-hand drive
• right-handed
• right-handedly
• right-handedness
• right-hander
• right-handers
• right-hand man
• Right Honourable
• righting
• rightings
• rightish
• rightism
• rightisms
• rightist
• rightists
• right, left and centre
• rightless
• right-lined