amend vs modify

amend

verb
  • To become better. 

  • To make better; improve. 

  • To make a formal alteration (in legislation, a report, etc.) by adding, deleting, or rephrasing. 

noun
  • An act of righting a wrong; compensation. 

modify

verb
  • To be or become modified. 

  • To change part of. 

  • To set bounds to; to moderate. 

  • To qualify the meaning of. 

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