concur vs sync

concur

verb
  • To meet in the same point; to combine or conjoin; to contribute or help towards a common object or effect. 

  • To converge. 

  • To agree (in action or opinion); to have a common opinion; to coincide; to correspond. 

sync

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. 

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

  • Harmony. 

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