FED vs afterglow

FED

noun

  • Field emission display. 

name

  • Federal Reserve System. Alternative spelling of Fed 

afterglow

noun

  • The mildly euphoric feeling experienced after a pleasurable experience, especially after an orgasm or drug-induced high. 

  • An afterparty. 

  • The glow seen in the sky after sunset. 

  • The light emitted by an incandescent object while cooling. 

  • The light emitted by a phosphor after excitation. 

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