haplology vs syncopation

haplology

noun
  • An instance of deleting one of two almost identical syllables within a word. 

  • The process of deleting one of two almost identical syllables within a word. 

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 haplology and syncopation occurred in a corpus of books? (source: Google Ngram Viewer )