befall vs decollate

befall

verb
  • To happen. 

  • To fall upon; fall all over; overtake 

  • To happen to. 

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

decollate

verb
  • To behead. 

  • To separate the copies of a multipart computer printout. 

adj
  • Tapering to a blunt end. 

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