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

Obviously pre-eminent

• ironiest
• ironing
• ironing-board
• ironing-boards
• ironings
• ironise
• ironised
• ironises
• ironising
• ironist
• ironists
• ironize
• ironized
• ironizes
• ironizing
• ironlike
• iron-liquor
• iron lung
• iron lungs
• iron maiden
• iron maidens
• iron-mail
• iron man
• Ironman
• ironmaster