entr'acte vs standstill

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. 

standstill

noun
  • complete immobility; halt 

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