decouple vs dissociate

decouple

verb
  • To unlink; to take or come apart. 

  • To muffle the seismic waves of (a nuclear explosion) by performing it underground. 

dissociate

verb
  • To make unrelated; to sever a connection; to separate. 

  • To undergo dissociation. 

  • To part; to stop associating. 

  • To separate compounds into simpler component parts, usually by applying heat or through electrolysis. 

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