arise vs befall

arise

verb
  • To come up from a lower to a higher position. 

  • To come up from one's bed or place of repose; to get up. 

  • To spring up; to come into action, being, or notice; to become operative, sensible, or visible; to begin to act a part; to present itself. 

befall

verb
  • To fall upon; fall all over; overtake 

  • To happen. 

  • To happen to. 

noun
  • Case; instance; circumstance; event; incident; accident. 

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