ague vs glaciation

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. 

glaciation

noun
  • The act of freezing. 

  • The process of covering with a glacier, or the state of being glaciated; the production of glacial phenomena; an ice age 

  • A particular instance of glacier formation. 

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