ex- vs under-

ex-

prefix
  • outside 

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

  • out of 

  • Lacking. 

under-

prefix
  • Behind 

  • Beneath, under 

  • Subordinate to 

  • Deficient, below what is correct 

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