eminent domain vs preemption

eminent domain

noun
  • 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. 

  • 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. 

preemption

noun
  • The purchase of public land by the occupant. 

  • The purchase of something before it is offered for sale to others. 

  • The displacement of a lower jurisdiction's laws when they conflict with those of a higher jurisdiction. 

  • The temporary interruption of a task without its cooperation and with the intention of resuming it at a later time. 

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