befall vs sync

befall

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

verb
  • To happen. 

  • To fall upon; fall all over; overtake 

  • To happen to. 

sync

noun
  • A music synchronization license, allowing the music to be synchronized with visual media such as films. 

  • Harmony. 

verb
  • To synchronize, especially in the senses of data synchronization, time synchronization, or synchronizing music with video. 

  • To flush all pending I/O operations to disk. 

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