omission vs syncopation

omission

noun
  • The shortening of a word or phrase, using an apostrophe ( ' ) to replace the missing letters, often used to approximate the sound of speech or a specific dialect. 

  • Something not done or neglected. 

  • An instance of those acts, or the thing left out thereby; something deleted or left out. 

  • The act of neglecting to perform an action one has an obligation to do. 

  • The act of omitting. 

syncopation

noun
  • The contraction of a word by means of loss or omission of sounds or syllables in the middle thereof. 

  • The quality of a rhythm being somehow unexpected, in that it deviates from the strict succession of regularly spaced strong and weak beats in a meter. 

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