anima vs fervor

anima

noun
  • The soul or animating principle of a living thing, especially as contrasted with the animus. 

  • The inner self (not the external persona) of a person that is in touch with the unconscious as opposed to the persona. 

  • The unconscious feminine aspect of a person. 

fervor

noun
  • An intense, heated emotion; passion, ardor. 

  • Heat. 

  • A passionate enthusiasm for some cause. 

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