sovereign

[1]	monarch , crowned head , 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

adj.

[1]	supreme , autonomous , independent , paramount , highest , self-governing , principal , foremost , greatest , predominant , dominant , ranking , leading , chief , superior , pre-eminent , ruling , regnant , reigning , governing , all-powerful , absolute , unlimited
[2]	royal , supreme , regal , majestic , noble , lordly , aristocratic , kingly , queenly