involve vs sync

involve

verb
  • To take in; to gather in; to mingle, blend or merge. 

  • To cause or engage (someone or something) to participate or to become connected or implicated. 

  • To comprise or include; to have as a related part. 

  • To complicate or make intricate. 

  • To envelop, enfold, entangle. 

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