ar- vs non-

ar-

prefix
  • Used to form the names of inverse hyperbolic trigonometric functions, and the symbols for these functions. 

  • Forming classification names for classes of organic compounds that contain a carbon skeleton and one or more aromatic rings. 

non-

prefix
  • prevocalic form of nona- 

  • Used in the sense of no or none, to show lack of or failure to perform; or in the sense of not, to negate the meaning of the word to which it is prefixed. 

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