entr'acte vs hiatus

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. 

hiatus

noun
  • An interruption, break or pause. 

  • A gap in a series, making it incomplete. 

  • An opening in an organ. 

  • A gap in geological strata. 

  • A syllable break between two vowels, without an intervening consonant. (Compare diphthong.) 

  • An unexpected break from work. 

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