ex- vs whilom

ex-

prefix
  • former, but still living (almost always used with a hyphen) 

  • out of 

  • outside 

  • Lacking. 

whilom

conj
  • During the same time that; while. 

  • Up to the time that; till, until. 

adv
  • At some time in the past; formerly, once upon a time. 

adj
  • At some time in the past; former, sometime. 

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