concordance vs sync

concordance

noun
  • Agreement; accordance; consonance. 

  • A list of occurrences of a word or phrase from a corpus, with the immediate context. 

  • An alphabetical verbal index showing the places in the text of a book where each principal word may be found, with its immediate context in each place. 

sync

noun
  • Harmony. 

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

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