ac- vs con-

ac-

prefix

  • to or with. 

  • oak. 

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 ac- and con- occurred in a corpus of books? (source: Google Ngram Viewer )