ex- vs syn-

ex-

prefix
  • outside 

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

  • out of 

  • Lacking. 

syn-

prefix
  • concomitant 

  • with, together 

  • identical 

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