co- vs con-

co-

prefix
  • together; mutually; jointly 

  • to the same degree 

  • partner or subordinate in an activity 

  • of the opposite, of the counterpart; dual 

con-

prefix
  • used with certain words to add a notion similar to those conveyed by with, together, or joint 

  • related to conlangs, conworlds, etc. 

  • constructed, artificial 

  • used with certain words to intensify their meaning 

  • hypothetical, fictional 

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