royalty vs ruler

royalty

noun
  • The rank, status, power or authority of a monarch. 

  • Payment made to a writer, composer, inventor etc for the sale or use of intellectual property, invention etc. 

  • The payment received by an owner of real property for exploitation of mineral rights in the property. 

  • Someone in a privileged position. 

  • A king and a queen as a starting hand in Texas hold 'em. 

  • The bounds of a royal burgh. 

  • A royal right or prerogative, such as the exploitation of a natural resource; the granting of such a right; payment received for such a right. 

  • People of royal rank, plus their families, treated as a group. 

ruler

noun
  • A person who rules or governs; someone or something that exercises dominion or controlling power over others. 

  • A (usually rigid), flat, rectangular measuring or drawing device with graduations in units of measurement; a straightedge with markings. 

verb
  • To beat with a ruler (as a traditional school punishment). 

How often have the words royalty and ruler occurred in a corpus of books? (source: Google Ngram Viewer )