entr'acte vs interlude

entr'acte

noun
  • An interval between two acts of a play or opera. 

  • Another performance, such as a piece of music or a dance, during this. 

interlude

noun
  • An entertainment between the acts of a play. 

  • An intervening episode, etc. 

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

verb
  • To provide with an interlude. 

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