befriend vs disappoint

befriend

verb
  • To favor. 

  • To become a friend of, to make friends with. 

disappoint

adj
  • disappointed 

verb
  • To deprive (someone of something expected or hoped for). 

  • To sadden or displease (someone) by underperforming, or by not delivering something promised or hoped for. 

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