incorporate vs refer

incorporate

verb
  • To include (something) as a part. 

  • To mix (something in) as an ingredient; to blend 

  • To admit as a member of a company 

  • To form into a legal company. 

  • To include (another clause or guarantee of the US constitution) as a part (of the Fourteenth Amendment, such that the clause binds not only the federal government but also state governments). 

  • To form into a body; to combine, as different ingredients, into one consistent mass. 

  • To unite with a material body; to give a material form to; to embody. 

adj
  • Not consisting of matter; not having a material body; incorporeal; spiritual. 

  • Not incorporated; not existing as a corporation. 

refer

verb
  • To mention (something); to direct attention (to something) 

  • To point to either a specific location in computer memory or to a specific object. 

  • To submit to (another person or group) for consideration; to send or direct elsewhere. 

  • To make reference to; to be about; to relate to; to regard; to allude to. 

  • To place in or under by a mental or rational process; to assign to, as a class, a cause, source, a motive, reason, or ground of explanation. 

  • Required to resit an examination. 

  • To be referential to another element in a sentence. 

  • To direct the attention of (someone toward something) 

noun
  • A blurb on the front page of a newspaper issue or section that refers the reader to the full story inside the issue or section by listing its slug or headline and its page number. 

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