ague vs chills

ague

noun
  • A chill, or state of shaking, as with cold. 

  • The cold fit or rigor of the intermittent fever 

  • An intermittent fever, attended by alternate cold and hot fits. 

verb
  • To strike with an ague, or with a cold fit. 

chills

noun
  • A feeling of being cold, a symptom of many conditions. 

  • A biological response to being tickled; being cold; or experiencing fear, euphoria or sexual arousal in which the person forms goose bumps. 

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