Sovereign (7)

(Other definitions for ruler that I've seen before include "Royal" , "Man in charge" , "Measuring tool" , "Monarch or yardstick" , "Stationery item" .)

(Other definitions for royal that I've seen before include "Member of ruling family" , "- Icing, - flush, - jelly" , "August" , "Queen, say?" , "King, queen, prince or princess?" .)

(Other definitions for emperor that I've seen before include "Purple --; -- penguin" , "Large richly coloured butterfly" , "Male ruler of a group of countries" , "He rules over several states" , "Sovereign - ruler" .)

(Other definitions for free that I've seen before include "At large" , "Liberal" , "Out of bondage" , "Not occupied; release" , "Generous, rid, available" .)

(Other definitions for lord that I've seen before include "Entitled" , "Proprietor of a manor?" , "Noble title" , "Member of the aristocracy" , "Male peer" .)

(Other definitions for king that I've seen before include "Chess piece" , "Card, draughts piece" , "Play set in medieval Britain" , "See 23 Down" , "Legendary monarch" .)

(Other definitions for prince that I've seen before include "Boxer Naseem Hamed's "title"" , "Sovereign's son" , "See 1" , "Monarch's son" , "Senior male member of a royal family after the sovereign" .)