n.
  - a supreme ruler, especially a monarch.
- a former British gold coin worth one pound sterling, now only minted for commemorative purposes.
adj.
   - possessing supreme or ultimate power. ▸archaic or literary possessing royal power and status. 
- (of a nation or its affairs) acting or done independently and without outside interference.
- dated very good or effective.
Derivative
  
  Etymology
  ME: from OFr. soverain, based on L. super ‘above’.