escalation vs interlude

escalation

noun
  • a deliberate or premeditated increase in the violence or geographic scope of a conflict 

  • The reassignment of a difficult customer problem to someone whose job is dedicated to handling such cases. 

  • an increase or rise, especially one to counteract a perceived discrepancy 

interlude

noun
  • An intervening episode, etc. 

  • An entertainment between the acts of a play. 

  • A short piece put between the parts of a longer composition. 

verb
  • To provide with an interlude. 

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