en- vs under-

en-

prefix

  • on, onto 

  • an intensifier 

  • caused 

  • in, into 

  • covered 

under-

prefix

  • Behind 

  • Beneath, under 

  • Subordinate to 

  • Deficient, below what is correct 

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