embolus vs seizure

embolus

noun
  • An obstruction causing an embolism: a blood clot, air bubble or other matter carried by the bloodstream and causing a blockage or occlusion of a blood vessel. 

  • The structure on the end of the palp of male arachnids which contains the opening to the ejaculatory duct. 

seizure

noun
  • A sudden onset of pain or emotion. 

  • The act of taking possession, as by force or right of law. 

  • A sudden attack or convulsion, (e.g. an epileptic seizure). 

  • That which is seized, or taken possession of; a thing laid hold of, or possessed. 

verb
  • To undergo an epileptic seizure. 

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