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

Obviously pre-eminent

• megalosaurian
• megalosaurs
• megalosaurus
• megalosauruses
• megamega-
• mega-merger
• mega-mergers
• meganewton
• meganewtons
• megaparsec
• megaparsecs
• megaphone
• megaphoned
• megaphone diplomacy
• megaphones
• megaphonic
• megaphoning
• megapixel
• megapixels
• megapode
• megapodes
• megara
• megarad
• megarads
• megaron