facile princeps /fasˈi-lē prinˈseps or fakˈi-le prinˈkeps/

Obviously pre-eminent

• swagsmen
• Swahili
• swain
• swaining
• swainings
• swainish
• swainishness
• swainishnesses
• swains
• swale
• swaled
• Swaledale
• swales
• swalier
• swaliest
• swaling
• swalings
• SWALK
• swallet
• swallets
• swallow
• swallow-dive
• swallow-dives
• swallowed
• swallower