detach vs set apart

detach

verb
  • To separate for a special object or use. 

  • To take apart from; to take off. 

  • To come off something. 

set apart

verb
  • Used other than figuratively or idiomatically: to separate or isolate. 

  • To distinguish, make obvious the distinction between (two things) or of (something). 

  • To select (something or someone) for a specific purpose. 

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