affiliate vs unify

affiliate

verb
  • To attach (to) or unite (with); to receive into a society as a member, and initiate into its mysteries, plans, etc. 

  • To adopt; to receive into a family as one's offspring 

  • To connect in the way of descent; to trace origin to. 

  • to bring or receive into close connection; to ally. 

  • To fix the paternity of 

noun
  • Someone or something, especially, a television station, that is associated with a larger, related organization, such as a television network; a member of a group of associated things. 

unify

verb
  • Cause to become one; make into a unit; consolidate; merge; combine. 

  • Become one. 

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