FED vs ardency

FED

noun

  • Field emission display. 

name

  • Federal Reserve System. Alternative spelling of Fed 

ardency

noun

  • Intensity of devotion. 

  • Intensity of light. 

  • Intensity of heat or burning. 

  • Intensity of feelings. 

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