disruption vs encroachment

disruption

noun
  • A breaking or bursting apart; a breach. 

  • An interruption to the regular flow or sequence of something. 

  • A continuing act of disorder. 

encroachment

noun
  • An intrusion upon another's possessions or rights; infringement. 

  • That which is gained by such unlawful intrusion. 

  • An unlawful diminution of the possessions of another. 

  • An entry into a place or area that was previously uncommon; an advance beyond former borders; intrusion; incursion. 

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