algor vs chills

algor

noun
  • cold, chilliness 

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 algor and chills occurred in a corpus of books? (source: Google Ngram Viewer )