1 monarch, ruler, emperor, empress, king, queen, prince, princess, potentate, chief, master, mistress, shah, sultan; Akund (of Swat), Gaekwar (of Baroda), Nizam (of Hyderabad), Mehtar (of Chitral), Nucifrage of Nuremberg, Sheikh of Araby, Colloq supremo:
She is the sovereign and must be obeyed.
2 supreme, paramount, highest, principal, foremost, greatest, predominant, dominant, ranking, leading, chief, superior, pre-eminent, ruling, regnant, reigning, governing, all-powerful, absolute, unlimited:
The first-born of the monarch is vested with sovereign authority upon the monarch's death.
3 royal, regal, majestic, noble, lordly, aristocratic, kingly, queenly:
He was hailed as the sovereign ruler of all the islands.