ecto- vs ex-

ecto-

prefix

  • outside 

  • ghost related (from ectoplasm ) 

ex-

prefix

  • outside 

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

  • out of 

  • Lacking. 

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