diadem vs eminent domain

diadem

noun
  • Regal power; sovereignty; empire—considered as symbolized by the crown. 

  • A crown. 

  • An ornamental headband worn as a badge of royalty. 

  • An arch rising from the rim of a crown (rarely also of a coronet), and uniting with others over its centre. 

verb
  • To adorn with a diadem; to crown. 

eminent domain

noun
  • In feudalism, the legal interest or rights of a lord or superior in an estate in land held in fee, as opposed to the vassal's or tenant's interest. 

  • The right of a government over the private property within its jurisdiction. Usually invoked to compel land owners to sell their property in preparation for a major construction project such as a freeway. 

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