interlock vs sync

interlock

noun
  • A safety device that prevents activation in unsafe conditions. 

verb
  • To interlace. 

  • To fit or clasp together securely. 

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 interlock and sync occurred in a corpus of books? (source: Google Ngram Viewer )