convulsion vs seizure

convulsion

noun
  • An intense, paroxysmal, involuntary muscular contraction. 

  • An uncontrolled fit, as of laughter; a paroxysm. 

  • Violent turmoil. 

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 convulsion and seizure occurred in a corpus of books? (source: Google Ngram Viewer )