arch-enemy /ärch-enˈə-mi/

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

• slanger
• slangers
• slangier
• slangiest
• slangily
• slanginess
• slanginesses
• sesamoids
• sese
• seseli
• seselis
• sesey
• sesh
• seshes
• Sesotho
• sesqui-
• sesquialter
• sesquialtera
• sesquialteras
• sesquicarbonate
• sesquicentenary
• sesquicentennial
• sesquioxide
• sesquioxides
• sesquipedal