dissociate vs disunite

dissociate

verb
  • To undergo dissociation. 

  • To part; to stop associating. 

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

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

disunite

verb
  • To disintegrate; to come apart. 

  • To cause disagreement or alienation among or within. 

  • To separate, sever, or split. 

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