set apart vs unite

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. 

unite

verb
  • To bring together as one. 

  • To come together as one. 

noun
  • A British gold coin worth 20 shillings, first produced during the reign of King James I, and bearing a legend indicating the king's intention of uniting the kingdoms of England and Scotland. 

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