further vs restrict

further

adj
  • More distant; relatively distant. 

  • More, additional. 

verb
  • To help forward; to assist. 

  • To encourage growth; to support progress or growth of something; to promote. 

adv
  • To a greater extent or degree. 

  • Beyond what is already stated or is already the case. 

  • Also; in addition; furthermore; moreover. 

  • Following on (from). 

  • To, at or over a greater distance in space, time or other extent. 

restrict

verb
  • To restrain within boundaries; to limit; to confine 

  • To consider (a function) as defined on a subset of its original domain. 

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