attach vs incorporate

attach

verb
  • To come into legal operation in connection with anything; to vest. 

  • To adhere; to be attached. 

  • To connect, in a figurative sense; to ascribe or attribute; to affix; with to. 

  • To win the heart of; to connect by ties of love or self-interest; to attract; to fasten or bind by moral influence; with to. 

  • To fasten, to join to (literally and figuratively). 

incorporate

verb
  • To form into a legal company. 

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

  • To admit as a member of a 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 include (something) as a part. 

  • 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. 

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