ex- vs sometime

ex-

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

  • out of 

  • outside 

  • Lacking. 

sometime

adj
  • Occasional. 

  • Former, erstwhile; at some previous time. 

adv
  • At an indefinite but stated time in the past or future. 

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