close to vs on the order of

close to

adv

  • Approximately 

  • Nearly; almost 

prep

  • Near. 

on the order of

adv

  • Approximately. 

prep

  • In the manner of; along the lines of; like; of a similar kind to; more-or-less equivalent to. 

How often have the words close to and on the order of occurred in a corpus of books? (source: Google Ngram Viewer )