over- vs under-

over-

prefix
  • Surrounding or covering. 

  • Superior. 

  • Excessive; excessively. 

  • Exceptional; extremely or intensely. 

  • Above, or higher. 

under-

prefix
  • Behind 

  • Beneath, under 

  • Subordinate to 

  • Deficient, below what is correct 

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