illness vs seizure

illness

noun
  • A state of bad health or disease. 

  • An instance of a disease or poor health. 

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